French word celui comes from Middle French iceluy (This one (the object/person in question).)

Detailed word origin of celui

Dictionary entry	Language	Definition
iceluy	Middle French (frm)	This one (the object/person in question).
icelui	French (fra)	(now, only in, _, law, or, humorous) this one.
celui	French (fra)	The one.

Words with the same origin as celui