What were the names of the twins born to Tamar, Judah's daughter-in-law?

Answer: Perez and Zerah

Perez broke out first; then his brother came out with the scarlet thread tied on his wrist and was named Zerah.

“But when he pulled his hand back and his brother came out, she said, “You have broken out first!” So he was named Perez.”— Genesis 38:29 (BSB)