Numbers 26:19-21

Er and Onan were sons of Judah, but they died in Canaan. The descendants of Judah by their clans were: through Shelah, the Shelanite clan; through Perez, the Perezite clan; through Zerah, the Zerahite clan. The descendants of Perez were: through Hezron, the Hezronite clan; through Hamul, the Hamulite clan.