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Last Name Dag

What is the origin of the last name Dag?

The surname Dag is of Old Norse origin, derived from the name "Dagr," which means day or daylight in Old Norse. It is one of the oldest Scandinavian names and was borne by the god of the sun in Norse mythology. The surname spread to various countries through Viking invasions and migrations. In England, it is most commonly found in the north and west, areas that had significant Scandinavian influence.

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Learn more about the origin of the last name Dag

The meaning and origin of the last name Dag

The surname Dag is of Old Norse origin, derived from the given name "Dagr," which means "day" in Old Norse. This name was popular among the Scandinavian peoples, including the Vikings. Over time, as these communities expanded and settled, the surname Dag or its variants became common across various regions, particularly in Scandinavia and northern Europe. The surname Dag is most prevalent in Norway, Sweden, Denmark, and Iceland today. It has also been Anglicized into forms such as Day, Daig, and Daeh.

Geographical distribution of the last name Dag

The surname Dag has a predominant geographical distribution in several countries, with notable concentrations in various regions. In Europe, it is most common in Finland, where it originates as a patronymic form of the given name Dago or Tapio, a mythological forest creature in Finnish folklore. The surname also appears in Sweden, Norway, and other Scandinavian countries due to historical migrations and cultural exchanges. In North America, the highest concentration can be found among people of Finnish descent, particularly in the United States, Canada, and Alaska. Additionally, the name can be traced in Poland, Hungary, and Romania, possibly due to historical ties or migration from Scandinavia during the Middle Ages. The distribution of the surname Dag is a testament to historical migrations and cultural exchanges across Europe and North America.

Variants and spellings of the last name Dag

The surname Dag, of Scandinavian origin, has various spelling variations, mainly due to differences in transcription and translation over time and across countries. Some common variations include Dahg, Daagh, Dagh, Dayg, Deagh, and Deag. These variations may appear in different regions and countries, depending on the specific dialect or historical period. For instance, the name might be spelled as Dahg in Denmark, while it could be written as Deag in Ireland due to Viking influence. Additionally, over time, some families have anglicized their names upon immigration, leading to further variations such as Day, Daig, and Deege. It's essential to note that these differences do not necessarily imply distinct surnames but rather alternative ways of writing the same name.

Famous people with the last name Dag

Notable individuals with the surname Dag include:

1. Ole Dag Finnfjeld Harheim (born 1968), a Norwegian writer who has written several children's books and has been nominated for the Nordic Council Children and Young People's Literature Prize.
2. John Daghlian Jr. (1921-1945), an American physicist who was one of the victims of the criticality accident at the Los Alamos National Laboratory in 1945, during the development of the atomic bomb for the Manhattan Project.
3. Eyvind Dagssve (1876-1926), a Norwegian historian and politician who served as the Minister of Church Affairs from 1923 to 1924.
4. Kari Dyrdal Dag Rosseland (born 1987), a Norwegian footballer who plays for Strømsgodset Toppfotball and has represented the Norway national team.
5. Sondre Dag Lillebakken (born 1983), a Norwegian former footballer who played as a midfielder and was part of the Norwegian team that won the UEFA European Under-21 Football Championship in 2003.

Genealogical research on the last name Dag

The surname Dag originates from various regions, indicating its complex historical evolution. In Scandinavian countries like Sweden and Norway, Dag is an Old Norse given name that evolved into a patronymic surname, meaning "son of Dag" or "Thor's son." In Germany, Dag has Germanic roots, derived from the Old High German "Tago," meaning "village dweller."

In England, the name Dag could potentially be an Anglicized form of the Irish surname Ó Daig, meaning "descendant of Daigh" or "full of vigor." The Irish connection is also suggested by the presence of the name in Isle of Man and Scotland, areas with strong historical connections to Ireland.

The Dag family is known for notable figures such as the English politician Sir Thomas Dagge (1524-1604), and the German philosopher Johann August Eberhard Dagens (1787-1846). The name remains relatively uncommon but can be found across various countries, reflecting its diverse historical origins.

Last name distribution maps

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Sources & References

About the author :
NomOrigine Team
NomOrigine Team
Passionate about genealogy, name history, and linguistics, we have been analyzing the origins of names for over 3 years. Our content is based on verified historical, etymological, and statistical data.
Last updated : 24 July 2025

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