Genesis 19:38 in the World English Bible
The younger also bore a son, and called his name Ben Ammi. He is the father of the children of Ammon to this day.
Context
37 And the firstborn bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
38 And the younger, she also bare a son, and called his name Ben-ammi: the same is the father of the children of Ammon unto this day.