1 Chronicles 2:26-28 New King James Version (NKJV)

26. Jerahmeel had another wife, whose name was Atarah; she was the mother of Onam.

27. The sons of Ram, the firstborn of Jerahmeel, were Maaz, Jamin, and Eker.

28. The sons of Onam were Shammai and Jada. The sons of Shammai were Nadab and Abishur.