The Hebrew words for “he sojourned there” are, שׁם גר gêr shām, which words are used Judges 18:30 in the genealogy of this young Levite, whose name was “Jonathan, the son of Gershom” (גרשׁם gêreshôm). Hence, some read here, “the son of Gershom.”
Related Commentaries of Judges 17:7
Judges 17:7
7 And there was a young man out of Bethlehemjudah of the family of Judah, who was a Levite, and he sojourned there.