“The sons of Perez were Hezron and Hamul.”
This is based on Genesis, chapter 46. These were the 2 sons of Perez listed as going to Egypt with Jacob when he went with all his sons to be with Joseph. There is not information about Perez or his sons. Hezron is the same name as one of Reuben’s sons or the first cousin of Perez. The Hezronites are either derived from Reuben’s son or Perez’s son. This Hezron, the son of Perez, is mentioned in the genealogies of Jesus in both the Gospel of Luke and the Gospel of Matthew. This indicates the importance of Perez and Hezron. Hamul lead to the Hamulites, as indicated in Numbers, chapter 26. However, his name is only mentioned 3 times, here, Genesis, and Numbers.