I Chronicles 6:5 Midrash

לְֽגֵרְשׁ֑וֹם לִבְנִ֥י בְנ֛וֹ יַ֥חַת בְּנ֖וֹ זִמָּ֥ה בְנֽוֹ׃

Of Gershom: Libni his son, Jahath his son, Zimmah his son;