Ammon was the son born from the incestuous relationship between Lot, Abraham's nephew, and Lot's daughter, and is the progenitor of the Ammonites.
Gen 19:30Lot was afraid to stay in Zoar, so he and his two daughters left Zoar and settled in the mountains, living in a cave with his two daughters.Gen 19:31The older daughter said to the younger, “Our father is old, and there is no man around to lie with us, as is the custom of the whole earth.Gen 19:32Let’s get our father to drink wine and then lie with him so that we can preserve our family line through our father.”Gen 19:33That night they got their father to drink wine, and the older daughter went in and lay with him. He was not aware of it when she lay down or when she got up.Gen 19:34The next day the older daughter said to the younger, “Last night I lay with our father. Let’s get him to drink wine again tonight, and you go in and lie with him so that we can preserve our family line through our father.”Gen 19:35So again that night they got their father to drink wine, and the younger daughter went in and lay with him. He was not aware of it when she lay down or when she got up.Gen 19:36So both of Lot’s daughters became pregnant by their father.Gen 19:37The older daughter had a son, and she named him Moab; he is the father of the Moabites of today.Gen 19:38The younger daughter also had a son, and she named him Ben-Ammi; he is the father of the Ammonites of today.