These are Shobal’s sons:
Alvan, Manahath, Ebal, Shepho, and Onam.

Shobal’s sons: Alian, Manahath, Ebal, Shephi, and Onam.
Zibeon’s sons: Aiah and Anah.

Jerahmeel had another wife named Atarah, who was the mother of Onam.

Onam’s sons: Shammai and Jada.
Shammai’s sons: Nadab and Abishur.