וַיִּהְי֥וּ בְנֵי־אוֹנָ֖ם שַׁמַּ֣י וְיָדָ֑ע וּבְנֵ֣י שַׁמַּ֔י נָדָ֖ב וַאֲבִישֽׁוּר׃
And the sons of Onam were Shammai, and Jada; and the sons of Shammai: Nadab, and Abishur.
Read midrashic interpretation of I Chronicles 2:28: and classical rabbinic exegesis.