Read Genesis 19:38 Using Other Translations
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.
The younger also bore a son and called his name Ben-ammi.He is the father of the Ammonites to this day.
When the younger daughter gave birth to a son, she named him Ben-ammi. He became the ancestor of the nation now known as the Ammonites.