French word appartenir comes from Latin teneo, Latin ad ((direction) toward, to, on, up to, for.), Latin pro

Detailed word origin of appartenir

Dictionary entry	Language	Definition
teneo	Latin (lat)	(of laws) I am binding on; bind, hold, obligate. (reflexive) I keep back, remain, stay, hold position. I comprise, contain, include, hold. I hold fast, restrain, detain, check, control; bind, fetter. I hold, have; grasp. I insist, uphold. I know, grasp, understand, conceive. I possess, occupy, control. I reach, attain; gain, acquire, obtain. I recollect, retain knowledge of, remember, bear [...]
ad	Latin (lat)	(direction) toward, to, on, up to, for.
pro	Latin (lat)	About. According to. As befitting. As, like. Before. For. In front, instead of. On behalf of.
pertineo	Latin (lat)	I am the property of, belong to; I am attributable to. I belong, relate, pertain, have concern. I extend, stretch out, reach, matter. I have a tendency to, tend to.
appertineo	Latin (lat)	(intransitive) I belong, pertain or appertain to.
appertinere	Late Latin (LL)
appertinēre	Late Latin (LL)
apartenir	Old French (fro)	To belong to.
appartenir	French (fra)	(intransitive) (+ à) to belong to. (intransitive) (+ à) to concern.

Words with the same origin as appartenir