Onan in the Bible

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

Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and produce offspring for your brother.”

But Onan knew that the offspring would not be his, so whenever he slept with his brother’s wife, he released his semen on the ground so that he would not produce offspring for his brother.

The LORD considered what Onan was doing to be evil, so he put him to death, too.

Judah’s sons: Er, Onan, Shelah, Perez, and Zerah; but Er and Onan died in the land of Canaan.
Perez’s sons: Hezron and Hamul.

The sons of Judah were Er and Onan: and Er and Onan died in the land of Canaan.

the sons of Judah, Er, and Onan, and Shelah, the three born to him of the daughter of Shua the Canaanitess, - but Er the firstborn of Judah became wicked in the eyes of Yahweh, and he slew him.