Possible meanings are 1) Mamre was another name for [Hebron](rc://en/tw/dict/bible/names/hebron) or 2) [Hebron](rc://en/tw/dict/bible/names/hebron) was formerly called Mamre or 3) Mamre was very near the larger city of [Hebron](rc://en/tw/dict/bible/names/hebron), so people usually called it [Hebron](rc://en/tw/dict/bible/names/hebron).