Dagr

In chapter 10, the enthroned figure of High states that Dagr is the son of the couple of Dellingr of the Æsir and his wife Nótt ("night").

[7] However, scholar Haukur Thorgeirsson points out that the four manuscripts of Gylfaginning vary in their descriptions of the family relations between Nótt, Jörð, Dagr, and Dellingr.

Haukur details that "the oldest manuscript, U, offers a version where Jǫrð is the wife of Dellingr and the mother of Dagr while the other manuscripts, R, W and T, cast Nótt in the role of Dellingr's wife and Dagr's mother", and argues that "the version in U came about accidentally when the writer of U or its antecedent shortened a text similar to that in RWT.

[8] Otto Höfler theorized that Dagr may be related to (or may be the same figure as) the hero Svipdagr (whose name means "the suddenly dawning day") who is attested in various texts.

Otto Höfler also proposed that Svipdagr may have been a "Dagr of the Suebi", and because of the names of his family members, Sólbjartr ("the sun-light", indicating a potential god of the skies) and Gróa ("growth", indicating a possible goddess of growth), and his wooing of Menglöð (often identified with the goddess Freyja), he further suggested that Svipdagr may have been a fertility god.