English word ancestor comes from Middle English (1100-1500) ancessour.
Ancestor etymology history?
Ancestor detailed word origin explanation
Middle English (1100-1500) (enm)
(figuratively) One who had the same role or function in former times.. (legal) One from whom an estate has descended;—the correlative of heir.. An earlier type; a progenitor. One from whom a person is descended, whether on the father's or mother's side, at any distance of time; a progenitor; a forefather.