I Chronicles 6:11 Midrash

אֶלְקָנָ֑ה בנו [בְּנֵי֙] אֶלְקָנָ֔ה צוֹפַ֥י בְּנ֖וֹ וְנַ֥חַת בְּנֽוֹ׃

As for Elkanah: the sons of Elkanah: Zophai his son, and Nahath his son;

Read midrashic interpretation of I Chronicles 6:11: and classical rabbinic exegesis.