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), 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:
Dag Terje Andersen (b. 1957), Norwegian politician
Dag Arnesen (b. 1950), Norwegian jazz musician
Dag Berggrav (1925–2003), Norwegian jurist, civil servant and sports administrator
Dag Bjørndalen (b. 1970), former Norwegian biathlete
Dag Fornæss (b. 1948), Norwegian, former speed skater
Dag Frøland (1945–2010), Norwegian comedian, revue artist and singer
Dag Gundersen (b. 1928), Norwegian linguist and lexicographer
Dag Hammarskjöld (1905–1961), Swedish UN General Secretary (1953-1961)
Dag Hartelius (b. 1955), Swedish diplomat
Dag Herbjørnsrud (b. 1971), Norwegian, former editor-in-chief of the Norwegian weekly news magazine Ny Tid
Dag Heward-Mills (b. 1963), Ghanaian Christian evangelist and author
Dag Ingebrigtsen (b. 1958), Norwegian musician
Dag Otto Lauritzen (b. 1956), Norwegian cyclist
Dag Alexander Olsen (b. 1989), Norwegian footballer
Dag Palovic (b. 1975), Slovakian Pokerstars Team Pro Member
Dag Erik Pedersen (b. 1959), Norwegian cyclist
Dag Prawitz (b. 1936), Swedish philosopher and logician
Dag Ringsson (? - ?), 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 (b. 1941), Norwegian author
Dag Spantell (b. 1950), Norwegian singer
Dag Volle (1963-1998) (Denniz Pop), Swedish pop music producer
Dag Wennlund, (b. 1963) Swedish javelin thrower
Dag C. Weberg (b. 1937), Norwegian politician
Dag Wirén (1905 – 1986), Swedish composer
"Dags", Daryl Somers, an Australian television personality
"DAG", David Alan Grier's nickname based on his initials.
Ekrem Dağ (b. 1980), Turkish football player
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
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