Genesis 38:4 in the World English Bible
She conceived again, and bore a son; and she named him Onan.
Context
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.
5 And she yet again conceived, and bare a son; and called his name Shelah: and he was at Chezib, when she bare him.