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 26:20-21
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.