Icelandic last names are not last names in the way the rest of the world understands them. Iceland uses a patronymic system, meaning most people’s surnames are formed from their father’s first name plus a suffix, not passed down through generations as a family name. If your father is named Jón, you are Jónsson (son of Jón) or Jónsdóttir (daughter of Jón). Your children will carry your name, not his. Every generation, the “last name” resets.
This makes Iceland genuinely unique in the modern world and means that Icelandic last names are, in practice, derived from first names. What follows is a look at the most common and historically significant patronymics and matronymics in Iceland today, plus the handful of traditional family surnames that do exist, and the rare cases where the system gets more creative.
How the Patronymic System Actually Works
The mechanics are simple but worth spelling out. A father named Magnús has a son named Árni and a daughter named Sigríður. The son is Árni Magnússon. The daughter is Sigríður Magnúsdóttir. They share a father but have different surnames. They will never share a surname with their own children either.
The suffixes are -son (son) and -dóttir (daughter). These are not abbreviations or nicknames; they are full Icelandic words. There is also a matronymic tradition, increasingly common, where the mother’s first name forms the base instead. A child of a woman named Guðrún could be Guðrúnarson or Guðrúnardóttir.
The Icelandic Naming Committee governs what names are permissible, and Iceland’s National Register tracks citizens by full name and national ID number rather than family surname. You do not look someone up by their last name the way you would in most countries. The phone book is alphabetized by first name.
The Most Common Patronymics in Iceland
These are the patronymics you will encounter most often, formed from Iceland’s most popular father’s names. Each one is a real, living surname carried by thousands of Icelanders today.
Jónsson / Jónsdóttir
From the father’s name Jón, the Icelandic form of John, itself from the Hebrew Yochanan meaning “God is gracious.” Jón has been one of Iceland’s most popular male names for centuries, making this among the single most common Icelandic last names in existence. Internationally, the scholar Árni Magnússon and countless modern Icelanders carry variants of this line.
Sigurðsson / Sigurðsdóttir
From the father’s name Sigurður, the Icelandic form of the Old Norse Sigurðr, meaning “victory guardian” from sigr (victory) and varðr (guardian). This is one of the most recognizably Norse of all Icelandic patronymics. Jóhanna Sigurðardóttir, Iceland’s prime minister from 2009 to 2013, is perhaps its most famous modern bearer.
Guðmundsson / Guðmundsdóttir
From Guðmundur, which breaks down as guð (god) plus mundr (protection or hand). A deeply traditional Norse name, Guðmundur has been a staple of Icelandic naming for over a thousand years. The patronymic is widespread across every region of the country.
Magnússon / Magnúsdóttir
From Magnús, the Latinized form of the Old Norse name meaning “great.” Introduced to Scandinavia largely through the fame of Charlemagne (Carolus Magnus), Magnús became deeply embedded in Icelandic naming culture. The scholar Árni Magnússon, born 1663, is the most celebrated historical bearer of this patronymic.
Björnsson / Björnsdóttir
From Björn, the Old Norse word for “bear,” used as a given name since Viking times. Bears carried enormous symbolic weight in Norse culture, representing strength and fearlessness. Hafthor Júlíus Björnsson, the Icelandic strongman and actor, has made this patronymic globally recognizable in the 21st century.
Kristjánsson / Kristjánsdóttir
From Kristján, the Icelandic form of Christian, from Latin Christianus. Christianity arrived in Iceland around 1000 CE, and names reflecting the new faith gradually became common. Kristján has remained popular for centuries, making this a very common patronymic in modern Iceland.
Ólafsson / Ólafsdóttir
From Ólafur, the Icelandic form of Óláfr, an ancient Norse name meaning “ancestor’s descendant” or “relic of the ancestors.” Óláfr was borne by multiple Norwegian kings and became hugely influential across the Norse world, including Iceland. The patronymic Ólafsson appears throughout Icelandic history and literature.
Einarsson / Einarsdóttir
From Einar, an Old Norse name meaning “lone warrior” or “one who fights alone,” from ein (one) and arr (warrior). Einar has been continuously used in Iceland since the settlement period. It is among the most purely Norse of the common Icelandic given names and thus patronymics.
Stefánsson / Stefánsdóttir
From Stefán, the Icelandic form of Stephen, from Greek Stephanos meaning “crown” or “wreath.” Vilhjálmur Stefánsson, the Arctic explorer of Icelandic descent, is the most internationally famous bearer. The name arrived with Christianity and has stayed firmly in use.
Kristinsson / Kristinsdóttir
From Kristinn, a distinctly Icelandic masculine form of Christian. While Kristján is the more formal borrowing, Kristinn is the native-feeling adaptation, and both have generated their own patronymic lines. This one is common enough to appear regularly in Icelandic directories.
Gunnarsson / Gunnarsdóttir
From Gunnar, the Old Norse name meaning “battle warrior,” from gunnr (war, battle) and arr (warrior). Gunnar is one of the great saga names, borne by Gunnar of Hlíðarendi in Njáls saga, arguably the most celebrated hero in Icelandic literary tradition. The patronymic carries serious cultural weight.
Helgason / Helgasdóttir
From Helgi, an Old Norse name meaning “holy” or “blessed,” from the Proto-Germanic root hailagaz. Helgi was common among the first settlers of Iceland in the ninth century. The patronymic Helgason appears throughout medieval Icelandic records and remains in use today.
Haraldsson / Haraldsdóttir
From Haraldur, the Icelandic form of Harald, from Old Norse Haraldr, meaning “army ruler.” Harald Fairhair, the Norwegian king whose unification of Norway reportedly drove many settlers to Iceland, makes this name foundational to Icelandic history itself. The patronymic echoes that origin story.
Þórarinsson / Þórarinsdóttir
From Þórarinn, a compound of Þór (Thor, the Norse god) and Ari (eagle). Þórarinn was a common name in the settlement era and medieval period. The patronymic, with its distinctive Icelandic thorn letter (Þ), looks exotic to outsiders but is thoroughly native to Iceland.
Karlsson / Karlsdóttir
From Karl, the Icelandic form of Carl or Charles, from Old Norse karl meaning “free man” or simply “man.” Karl has been used as a given name in Iceland since the Viking Age. It is simple, strong, and the patronymic it generates is among the more common in the country.
Patronymics from Old Norse God and Mythology Names
Iceland’s pre-Christian heritage left a permanent mark on its naming culture. Names rooted in Norse mythology, especially those invoking Thor and other gods, have never gone out of fashion and generate some of the most recognizable Icelandic patronymics.
Þórsson / Þórsdóttir
From Þór, the Icelandic form of Thor, the Norse god of thunder. Naming a child Þór directly invokes the deity, and this has been done continuously since the Viking Age. The patronymic Þórsson is clean, strong, and unmistakably Icelandic.
Þórssonsson / Þórsdóttir
Note: the base name here is simply Þór. This entry is included to clarify that Þór as a standalone given name generates Þórsson for sons, not to be confused with the longer compound names below.
Þórðarson / Þórðardóttir
From Þórður, an Icelandic form of the Old Norse Þórðr, meaning “Thor’s god” or “devoted to Thor.” Þórður has been one of Iceland’s most persistent traditional names, and Þórðarson appears throughout the medieval sagas and modern records alike.
Þórssonsson
Removed from list to avoid duplication. See Þórðarson above.
Þorsteinnsson / Þorsteinnsdóttir
From Þorsteinn, combining Þór (Thor) with steinn (stone). Þorsteinn was one of the most popular names in Viking Age Iceland, appearing repeatedly in the sagas as a name for strong, reliable men. This is one of the older and more historically grounded patronymics in the language.
Þorbergsson / Þorbergsdóttir
From Þorbergur, a compound of Thor’s name and bjarg (rock, cliff, or help). Þorbergur Þórðarson, the 20th-century Icelandic writer and provocateur, is one of the most famous literary bearers. An unusual but entirely genuine name with deep roots.
Þorvaldsson / Þorvaldsdóttir
From Þorvaldur, combining Þór with valdr (ruler, power). Þorvaldur Eiríksson, known as Thorvald Eiriksson, was the son of Eiríkur rauði (Erik the Red) and brother of Leifur Eiríksson, making this name part of the most famous family in Icelandic saga history.
Friðriksson / Friðriksdóttir
From Friðrik, the Icelandic form of Frederick, from Old High German meaning “peaceful ruler.” Friðrik is not a mythology name, but it fits here as a classically Icelandic adaptation of a Continental name that has been used in Iceland for several centuries.
Patronymics from Saga-Era Names
The Icelandic sagas, written in the 12th and 13th centuries but recording events from the 9th through 11th, are a living naming resource. Many of the names in the sagas are still given to Icelandic children today, which means the patronymics they generate are still active.
Eiríksson / Eiríksdóttir
From Eiríkur, the Icelandic form of Erik, from Old Norse meaning “ever powerful” or “eternal ruler.” Eiríkur rauði, Erik the Red, is the most famous bearer, and his son Leifur Eiríksson is credited with reaching North America around 1000 CE. This is one of the most historically charged of all Icelandic patronymics.
Leifsson / Leifsdóttir
From Leifur, the Icelandic form of Leif, from Old Norse leifr meaning “heir” or “descendant.” Leifur Eiríksson is Iceland’s most celebrated explorer, and his name has been given to Icelandic children ever since. The patronymic Leifsson is not the most common but is deeply resonant.
Ingólfsson / Ingólfsdóttir
From Ingólfur, a compound of Ing (the Norse god Freyr’s alternate name) and ulfr (wolf). Ingólfur Arnarson is the first permanent settler of Iceland, arriving in the 870s. His name is practically synonymous with Icelandic origins, and the patronymic it generates carries that founding weight.
Egillsson / Egillsdóttir
From Egill, an Old Norse name of uncertain but likely pre-Norse origin, possibly meaning “edge” or “awe.” Egill Skallagrímsson, the 10th-century poet and warrior, is one of the most vivid characters in all of saga literature. His name has been given to Icelanders across the centuries, generating this patronymic.
Gíslasson / Gíslasdóttir
From Gísli, an Old Norse name possibly related to gísl (hostage or pledge). Gísli Súrsson, the outlaw hero of Gísla saga, is one of the great tragic figures of Old Norse literature. The name has remained in steady use in Iceland and the patronymic is a real modern surname.
Njálsson / Njálsdóttir
From Njáll, the Icelandic form of the Old Irish name Niall, meaning “champion.” Njáll Þorgeirsson, the wise and doomed hero of Njáls saga, is one of the defining characters of Icelandic literature. The name is distinctly Icelandic in feel despite its Irish origin and the patronymic appears in historical records.
Snorrason / Snorrasdóttir
From Snorri, an Old Norse byname or given name whose origin is debated but may relate to a word for “swift” or “lively.” Snorri Sturluson, the 13th-century historian and mythographer who wrote the Prose Edda and Heimskringla, is the most important Icelandic writer in history. His name remains in use and the patronymic it generates is entirely genuine.
Sturluson / Sturluson
Strictly speaking, Sturluson is the one famous case of an Icelandic patronymic being used almost as a surname, because Snorri Sturluson’s patronymic (from his father Sturla) became so attached to him that it functions as a name in its own right. Sturla as a given name is real, ancient, and still occasionally used in Iceland.
Hrafnsson / Hrafnsdóttir
From Hrafn, the Old Norse word for “raven,” used as a given name since Viking times. Ravens were sacred to Odin and deeply embedded in Norse symbolism, so naming a child Hrafn was a serious cultural statement. The patronymic is genuine and appears in both historical and modern Icelandic records. Sigurdur Ingi Johannsson’s predecessor as Prime Minister, Sigmundur Davíð Gunnlaugsson, is unrelated, but Hrafn Jökulsson is a real modern Icelander bearing this lineage.
Úlfsson / Úlfsdóttir
From Úlfur, the Icelandic form of the Old Norse ulfr, meaning “wolf.” Wolf names were among the most common in the Viking Age, and Úlfur has remained in continuous Icelandic use. The patronymic is ancient and genuine.
Matronymic Surnames: Iceland’s Growing Tradition
Iceland formally recognized matronymics, surnames formed from the mother’s name, as equally valid in the 20th century. Today, a meaningful number of Icelanders carry their mother’s name as the base of their surname, either by choice or because the father is absent or unknown. These are real, registered Icelandic last names.
Guðrúnarson / Guðrúnardóttir
From Guðrún, one of the most beloved Old Norse women’s names, meaning “god’s secret lore” from guð (god) and rún (secret, rune). Guðrún is the heroine of the Laxdæla saga and a major figure in the Eddic poems. When a child takes their mother Guðrún’s name, this is the result.
Sigríðarson / Sigríðardóttir
From Sigríður, the Icelandic form of the Old Norse Sigríðr, meaning “beautiful victory” from sigr (victory) and fríðr (beautiful, beloved). Sigríður has been one of Iceland’s most popular women’s names for centuries, and when it forms the base of a matronymic, this is the result.
Katrínarson / Katrínarsdóttir
From Katrín, the Icelandic form of Katherine, from Greek Aikaterine, whose meaning is debated but likely connects to purity. Katrín is extremely popular in modern Iceland, making matronymics based on it increasingly common.
Ingibjargardóttir / Ingibjargason
From Ingibjörg, a compound of Ing (the divine name) and björg (help, salvation). Ingibjörg is a classically Icelandic woman’s name with roots in the settlement era. The matronymic it generates is long but entirely genuine and registered in Iceland’s naming system.
Þórunarson / Þórunardóttir
From Þórunn, a compound of Þór (Thor) and unnr (wave, or love). Þórunn appears in the sagas and has been used as a woman’s name in Iceland since Viking times. The matronymic is real and documented.
Helgudóttir / Helguson
From Helga, the feminine form of Helgi, meaning “holy” or “blessed.” Helga is one of the oldest continuously used women’s names in Iceland. When a child takes a mother named Helga as their naming source, Helgudóttir or Helguson is the result.
Ragnheiðardóttir / Ragnheiðarson
From Ragnheiður, combining regin (counsel, gods) with heiðr (honor, brightness). Ragnheiður is a traditional Icelandic woman’s name with strong medieval roots, and its matronymic form is registered and used in contemporary Iceland.
Traditional Family Surnames: Iceland’s Rare Exceptions
A small number of Icelandic families do have hereditary surnames in the European tradition. These are mostly descended from Danish or other foreign settlers during the period of Danish rule, or from Icelanders who adopted Danish-style surnames in the 18th and 19th centuries. Iceland’s 1925 law effectively froze new hereditary surnames, meaning these are genuinely rare. If an Icelander today has a hereditary surname, it is almost certainly from one of these lineages.
Zoëga
A family of Danish-Icelandic origin. Geir Tómasson Zoëga, the 20th-century diplomat and lexicographer, is the most famous bearer. The name is Danish in origin and was retained as a hereditary surname under the rules applicable to foreign-derived families.
Briem
A rare hereditary surname in Iceland, borne by a family of foreign-descended origin. Helgi Péturss Briem was a notable 19th-century Icelander who carried it. Like Zoëga, it survived the 1925 law because it predated it.
Blöndal
Another of Iceland’s genuine hereditary surnames, associated with a prominent family that includes Sigfús Blöndal, the 20th-century lexicographer who compiled one of the major Danish-Icelandic dictionaries. The name has Danish roots and is one of the most recognized hereditary surnames in Iceland.
Jónás
A very rare hereditary surname in Iceland, distinct from the patronymic Jónsson. Its survival as a family name rather than a patronymic reflects the small number of exceptions that exist in the Icelandic naming system.
Modern and Newly Registered Icelandic Patronymics
Iceland’s naming culture is not static. New given names are approved by the Naming Committee regularly, and as those names become fathers’ and mothers’ names, new patronymics come into existence. Some of the newer entries in Icelandic naming reflect both international influence and a continuing love for the old Norse roots.
Alexsson / Alexsdóttir
From Alex, used as a standalone given name in Iceland and approved by the Naming Committee. As Icelandic parents have embraced shorter international names, Alex has become common enough to generate its own patronymic line.
Daníelsson / Daníelsdóttir
From Daníel, the Icelandic form of Daniel, from Hebrew meaning “God is my judge.” Biblical names entered Iceland with Christianity and Daníel has been in use for centuries. The patronymic is common in modern Iceland.
Ársælsson / Ársælsdóttir
From Ársæll, an Old Norse name meaning “prosperous year” or “blessed with a good year,” from ár (year, harvest) and sæll (happy, blessed). It is rare but genuine, a name from the old tradition that has never entirely disappeared.
Baldursson / Baldursdóttir
From Baldur, the Icelandic form of Baldr, the Norse god of light and purity. Naming a child Baldur is an explicit invocation of this beloved deity, and Baldursson as a patronymic is entirely real and registered in Iceland today.
Freyrsson / Freyrsdóttir
From Freyr, the Norse god of fertility, prosperity, and sunshine. Using a god’s name directly as a given name is unusual but not unheard of in Iceland, and Freyr has been approved and used as a modern given name, generating this patronymic.
Vignisson / Vignisdóttir
From Vignis or Vigni, rare but registered Icelandic given names. These are genuinely in Iceland’s name registry, even if uncommon, and the patronymics they generate appear in records.
Heiðarsson / Heiðarsdóttir
From Heiðar or Heiðarr, derived from heiðr meaning “honor” or “brightness.” Heiðar is used as a given name in Iceland and is registered with the Naming Committee. The patronymic appears in modern Icelandic directories.
Ármannsson / Ármannsdóttir
From Ármann, an Old Norse compound of ár (year, messenger) and maðr (man). Ármann has been in Icelandic use since the medieval period and remains a registered given name today, generating this patronymic in current use.
How to Understand and Use Icelandic Last Names
If you are researching Icelandic ancestry, writing an Icelandic character, or simply trying to make sense of Icelandic names you have encountered, a few practical points will help enormously.
First, never alphabetize Icelanders by their last name. In Iceland, the phone directory, school rolls, and official registers are organized by first name. When you see an Icelandic last name like Sigurðardóttir, that name tells you the person’s father was named Sigurður, not that they belong to a “Sigurðardóttir family.” Siblings in the same household can have different last names if they are different sexes, and children will have last names different from both parents.
Second, the genitive form matters. When a father named Jón gives his name to his children, it does not become Jónsson directly from Jón. The father’s name goes into the genitive case first: Jóns (of Jón), and then -son or -dóttir is added. This is why some patronymics look slightly different from the base name. Magnús becomes Magnúsar in the genitive, giving Magnúsarson, which in modern use is often shortened to Magnússon.
Third, if you are writing an Icelandic character, give them a first name that fits the era and a patronymic derived from a plausible father’s name. A modern Icelandic woman named Brynja whose father is named Gunnar would be Brynja Gunnarsdóttir. A medieval Icelandic man named Ormur whose father is named Þorsteinn would be Ormur Þorsteinnsson. The system is logical and consistent; once you know the rules, you can construct any Icelandic last name from scratch.
Finally, for those researching family history: Icelandic genealogical records are extraordinarily thorough. Iceland has maintained detailed parish records and census data since the 17th century, and the national genealogical database Íslendingabók (the Book of Icelanders) traces family connections across the entire population. Because everyone’s last name contains their father’s first name, tracing lineage backward through Icelandic records is actually more intuitive than in family-surname cultures, once you understand the system.
Icelandic last names are a living piece of the Old Norse world, updated every generation with new first names but governed by the same grammar and logic that Viking Age Icelanders used a thousand years ago. They are not relics. They are a naming system that works, that every Icelander understands intuitively, and that makes every surname a direct, personal statement about parentage rather than a piece of inherited family branding.
