Genesis 19:38

Likewise, the younger gave birth to a son, and she called his name Ammon, that is, ‘the son of my people.’ He is the father of the Ammonites, even today

Other versions

King James Version

And the younger, she also bare a son, and called his name Benammi: the same is the father of the children of Ammon unto this day.

English Standard Version

The younger also bore a son and called his name Ben-ammi. He is the father of the Ammonites to this day.

New International Version

The younger daughter also had a son, and she named him Ben-Ammi; he is the father of the Ammonites of today.