Genesis 19:38 in the King James Version
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.
Context
37 The firstborn bore a son, and named him Moab. He is the father of the Moabites to this day.
38 The younger also bore a son, and called his name Ben Ammi. He is the father of the children of Ammon to this day.