Er and Onan were sons of Judah who died early on in Canaan. The sons of Judah by clans:Shelah and the Shelanite clan,Perez and the Perezite clan,Zerah and the Zerahite clan.The sons of Perez:Hezron and the Hezronite clan,Hamul and the Hamulite clan.These were the clans of Judah. They numbered 76,500.