Jonathan’s sons: Peleth and Zaza. These were the descendants of Jerahmeel.

and Ziza son of Shiphi, son of Allon, son of Jedaiah, son of Shimri, son of Shemaiah—

Shimei’s sons: Jahath, Zizah, Jeush, and Beriah. Those were Shimei’s sons—four.

Jahath was the first and Zizah was the second; however, Jeush and Beriah did not have many sons, so they became an ancestral house and received a single assignment.