Genesis 4:17, 25-26

Cain had sexual relations with his wife, and she became pregnant and gave birth to Enoch. Then Cain founded a city, which he named Enoch, after his son.

Adam had sexual relations with his wife again, and she gave birth to another son. She named him Seth, for she said, “God has granted me another son in place of Abel, whom Cain killed.” When Seth grew up, he had a son and named him Enosh. At that time people first began to worship the LORD by name.