Moab: the people, land and kingdom east of the Dead Sea, traced in Genesis to a son of Lot, and one of Israel's closest and most quarrelsome neighbors
Genesis starts the name with a single boy: the son born to Lot's older daughter after Sodom burned, and in the same breath the text calls him the father of the people who carry his name. From there the word spreads outward the way a family name can become a country's name, until one set of letters covers a man, a stretch of highland east of the Dead Sea, the people living on it, and the kingdom they answered to.
So the sentence around the word decides what it is pointing at:
- the flat ground by the Jordan across from Jericho is "the plains of Moab", a campsite rather than a country
- the farm country Naomi's family fled to in a famine is "the fields of Moab"
- Israel's armies strike "Moab" when what they strike is an army
- envoys are sent to "the king of Moab", where the name stands for a state with a throne
- and the prophets say "Moab" and mean one weeping, boasting, humiliated figure
That last use is the one that surprises readers. In Isaiah 15 and 16, and in the long poem of Jeremiah 48, Moab is neither a map nor a population but a person: at ease since his youth, ashamed of his own god, his horn cut off and his arm broken, wailing on the rooftops. The prophets who announce his ruin also grieve over it out loud, and Jeremiah's poem closes by promising that God will one day restore him.
The name is almost never spoken alone. Ammon (עַמּוֹן) is its brother nation in the Genesis story and its constant partner in the lists of Israel's neighbors, and Edom (אֱדוֹם) stands beside them both. A single person from Moab gets a different word (מוֹאָבִי), which is how Ruth is described, and that word is why the nation's best known member is a woman who married into Israel.