Genesis 38:4 in the King James Version
And she conceived again, and bare a son; and she called his name Onan.
Context
3 She conceived, and bore a son; and he named him Er.
4 She conceived again, and bore a son; and she named him Onan.
5 She yet again bore a son, and named him Shelah. He was at Chezib when she bore him.