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.

Genesis 38:3

38:3 She became pregnant and had a son. Judah named him Er.

Genesis 38:6

38:6 Judah acquired a wife for Er his firstborn; her name was Tamar.