Genesis 38:2-6

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

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

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

And she yet again conceived, and bare a son; and called his name Shelah: and he was at Chezib, when she bare him.

And Judah took a wife for Er his firstborn, whose name was Tamar.