Kejadian 19:38

19:38 The younger daughter also gave birth to a son and named him Ben-Ammi. ¹  He is the ancestor of the Ammonites of today.

Hakim-hakim 10:11

10:11 The Lord said to the Israelites, “Did I not deliver you from Egypt, the Amorites, the Ammonites, the Philistines,

[19:38]  ¹ sn The name Ben-Ammi means “son of my people.” Like the account of Moab’s birth, this story is probably included in the narrative to portray the Ammonites, another perennial enemy of Israel, in a negative light.