Meaning: Its source is dagr, an Old Norse name meaning "Day."

Languages: This boy's name is used in Norwegian, Swedish and Danish.

Narrative: In Norse mythology, Dag is the son of Nótt (night) and Dellingr (daybreak). Once every twenty-four hours, he drives his horse Skinfaxi (shining mare) around the earth, illuminating it with the light from Skinfaxi's hair.