Genesis 46:12

46:12 The sons of Judah:

Er, Onan, Shelah, Perez, and Zerah

(but Er and Onan died in the land of Canaan).

The sons of Perez were Hezron and Hamul.

Numbers 26:20-22

26:20 And the Judahites by their families were: from Shelah, the family of the Shelahites; from Perez, the family of the Perezites; and from Zerah, the family of the Zerahites. 26:21 And the Perezites were: from Hezron, the family of the Hezronites; from Hamul, the family of the Hamulites. 26:22 These were the families of Judah according to those numbered of them, 76,500.