Genesis 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.

Genesis 36:10

36:10 These were the names of Esau’s sons:

Eliphaz, the son of Esau’s wife Adah, and Reuel, the son of Esau’s wife Basemath.

[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.