Er

She conceived and had a son, whom he named 'Er.

Y'hudah took a wife for 'Er his firstborn, and her name was Tamar.

But 'Er, Y'hudah's firstborn, was evil from ADONAI's perspective, so ADONAI killed him.

The sons of Y'hudah: 'Er, Onan, Shelah, Peretz and Zerach; but 'Er and Onan died in the land of Kena'an. The sons of Peretz were Hetzron and Hamul.

The sons of Y'hudah: First 'Er and Onan, but 'Er and Onan died in the land of Kena'an.

The sons of Y'hudah: 'Er, Onan and Shelah; the mother of these three was Bat-Shua the Kena'anit. 'Er, Y'hudah's firstborn, was wicked from ADONAI's perspective, so he killed him.