Helgi means holy and is an old Nordic name still used in e.g. Iceland.
Helgi or Halga (Beowulf), Proto-Norse *Hailagaz[[1]. ], was a Danish Scylding/Skjöldung king. He was the son of Halfdan (Healfdene), the brother of Hróar (Hrothgar) and the father of Hrólf Kraki (Hrothulf).
Helgi was killed in battle by the Swedish king Adils (Eadgils), and was succeeded by Hróar and Hrólf Kraki.
See also Origins for Beowulf and Hrólf Kraki for more on the historical background of these characters.
Saxo Grammaticus appears to have confused him with Helgi Hundingsbane.
The name is sometimes Anglicized as Helge.
