Genesis 38:3-7

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

Then she conceived again and gave birth to a son, and she named him Onan.

She gave birth to yet another son and named him Shelah; and it was at Chezib that she gave birth to him.

Now Judah took a wife for Er his firstborn, and her name was Tamar.

But Er, Judah’s firstborn, was evil in the sight of the Lord, so the Lord took his life.