Genesis 38:2-4

Wycliffe Bible

² and he saw there a daughter of a man of Canaan, Shuah by name. And when he had taken her to wife, he entered [in] to her (her slept with her),

³ and she conceived, and childed a son, and (he) called his name Er.

⁴ And again when another child was conceived, she named the child (that was) born, Onan.