Genesis 38:3

Christian Standard Bible Anglicised

She conceived and gave birth to a son, and he named him Er.

Cross References

Numbers 26:19

Judah’s sons included Er and Onan, but they died in the land of Canaan.

Genesis 46:12

Judah’s sons: Er, Onan, Shelah, Perez, and Zerah; but Er and Onan died in the land of Canaan. The sons  of Perez were Hezron and Hamul.

1 Chronicles 2:3

Judah’s   sons: Er, Onan, and Shelah.  These three were born to him by Bath-shua the Canaanite woman. Er, Judah’s firstborn, was evil in the Lord’s sight, so he put him to death.