Ammon (אַמּוֹן) refers to the Ammonite people and territory east of the Jordan River. The name derives from Genesis 19:38: Ben-Ammi ("son of my people"), the son of Lot by his younger daughter, became the ancestor of the Ammonites. Their territory lay between the Arnon and Jabbok rivers in Transjordan.
The Ammonites serve as a recurring foil in Israel's story — closely related through Lot (Abraham's nephew) yet consistently hostile. Deuteronomy 23:3 excluded them from the assembly of Israel. Yet God's grace broke through: Naamah the Ammonite was the mother of Rehoboam, placing Ammonite ancestry in the Davidic line (1 Kings 14:21). This anticipates the NT: in Christ, all ethnic hostilities dissolve (Ephesians 2:14–16), and nations once excluded are welcomed into God's family.