French word aucun comes from Latin aliqui (Some.), Latin unum

Detailed word origin of aucun

Dictionary entry	Language	Definition
aliqui	Latin (lat)	Some.
unum	Latin (lat)
*alicunus	Latin (lat)	(Vulgar Latin) some.
alcun	Old French (fro)
aucun	French (fra)	No, none, not any None, no-one.

Words with the same origin as aucun