Genesis 38:3 KJV

And she conceived, and bare a son; and he called his name Er.
Genesis 38:3, King James Version

In context

2 And Judah saw there a daughter of a certain Canaanite, whose name was Shuah; and he took her, and went in unto her.

3 And she conceived, and bare a son; and he called his name Er.

4 And she conceived again, and bare a son; and she called his name Onan.