Analysis of information sources in references of the Wikipedia article "Egill Skallagrímsson" in English language version.
The following nouns were used about people of mixed parentage:".."halftroll 'a half troll'. This is used as the nickname of Hallbjorn of Ramsta in Namdalen, father of Ketill hoengr, and ancestor of some of the settlers of Iceland, including Skalla-Grimr.