Dag is a masculine Scandinavian given name derived from the Old Norse dagr, meaning "day", or the name of the god Dagr, a personification of the day. It is most commonly used in Norway and Sweden. In Sweden, September 16 is Dag's Name Day. Dag is uncommon as a surname. People with the name Dag include:
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Given name
Dag Terje Andersen (born 1957), Norwegian politician
Dag Arnesen (born 1950), Norwegian jazz musician
Dag Arvas (1913–2004), Swedish Navy rear admiral
Dag Berggrav (1925–2003), Norwegian jurist, civil servant and sports administrator
Dag Bjørndalen (born 1970), Norwegian former biathlete
Dag Fornæss (born 1948), Norwegian former speed skater
Dag Frøland (1945–2010), Norwegian comedian, revue artist and singer
Dag Gundersen (1928–2016), Norwegian linguist and lexicographer
Dag Hammarskjöld (1905–1961), Swedish UN Secretary-General (1953–1961)
Dag Hartelius (born 1955), Swedish diplomat
Dag Herbjørnsrud (born 1971), Norwegian, former editor-in-chief of the Norwegian weekly news magazine Ny Tid
Dag Heward-Mills (born 1963), Ghanaian Christian evangelist and author
Dag Ingebrigtsen (born 1958), Norwegian musician
Dag Juhlin (born 1962), American musician and podcaster
Dag Larsson (born 1960), Swedish politician
Dag Otto Lauritzen (born 1956), Norwegian cyclist
Dag Alexander Olsen (born 1989), Norwegian footballer
Dag Palovič (born 1975), Slovak TV presenter and poker player
Dag Erik Pedersen (born 1959), Norwegian cyclist
Dag Prawitz (born 1936), Swedish philosopher and logician
Dag Ringsson (died), Norwegian, member of Olav Haraldsson's army at the battle of Stiklest
Dag Schjelderup-Ebbe (1926–2013), Norwegian musicologist, composer, music critic and biographer
Dag Solstad (born 1941), Norwegian author
Dag Spantell (1950–2025), Norwegian singer
Dag Volle (1963–1998) (Denniz Pop), Swedish pop music producer
Dag C. Weberg (born 1937), Norwegian politician
Dag Wennlund (born 1963), Swedish javelin thrower
Dag Wirén (1905–1986), Swedish composer
Nickname
"Dags", Daryl Somers, an Australian television personality
"DAG", David Alan Grier's nickname based on his initials
Surname
Burcu Dağ (born 1981), Turkish para-archer
Ekrem Dağ (born 1980), Turkish football player
Şevket Dağ (1876–1944), Turkish artist and politician
Fictional characters
Dag Redwing Hickory, male protagonist of Lois McMaster Bujold's series of novels "The Sharing Knife"
Rick "Dag" Dagless, a character on the TV series Garth Marenghi's Darkplace
Daggett Doofus Beaver, a cartoon character from Nickelodeon TV Series "The Angry Beavers"
Dag Daughtry, a character in Jack London's novel Michael, Brother of Jerry
The Dag, a character in the 2015 film Mad Max: Fury Road
Dag, the main antagonist of Barnyard
Dag, a side character from Assassin's Creed Valhalla