Edom: the second name given to Esau, and from him the people and kingdom descended from him and the dry hill country they held south and east of the Dead Sea
Edom is a second name, and the story behind it turns on the color red. Esau came in from the field starving and traded his birthright for a bowl of red stew, and Genesis says that is why he was called "Red," which in Hebrew sounds like Edom. The name stuck, and then it kept traveling: from the man, to the family that came from him, to the rugged country south and east of the Dead Sea where they settled.
So one word does three jobs, and the context tells a reader which one is in view:
- in the Genesis stories it is Esau himself (עֵשָׂו), under his other name
- in the histories and the prophets it is a people and a kingdom, with a king who receives envoys, an army that blocks a road, and a habit of rebelling against Judah
- in border lists and travel notes it is simply a place, the land Israel had to march around and the frontier Judah's territory ran up against
What gives the name its weight is the family tie. Edom is not a distant foreign power but Israel's nearest blood relative, and the prophets never let that go. Amos condemns Edom for pursuing his brother with the sword, and the psalm that remembers the fall of Jerusalem asks God to remember what the people of Edom shouted on that day. The rivalry of two brothers in one womb becomes the long quarrel of two peoples along one border.
The red keeps returning. Isaiah pictures a figure striding up out of Edom, out of Bozrah, with his clothing stained crimson, and the image lands because the name of the country and the Hebrew word for "red" (אָדֹם) sound so much alike.