According to the Landnámabók Ingjald was the son of Helgi, the son of Olaf, the son of Gudrod, the son of Halfdan Hvitbeinn; he was thus distantly related to the Yngling kings of Vestfold and later Norway. According to Eyrbyggja saga, Ingjald's mother was Thora, a daughter of Sigurd Snake-in-the-Eye, who was a son of Ragnar Lodbrok. However, this connection is dubious, as Ingjald appears to have been born in the early 9th Century – either before or at around the same time as Ragnar.
- In some sources his father's name is given as Olaf. In Laxdæla saga his father's name is given as "King Frodi the Valiant, who was slain by Jarl Sverting and his sons."