Mouchoir etymology in French

Etymology Blog

French word mouchoir comes from French moucher, French -oir

Dictionary entry	Language	Definition
moucher	French (fr)	(reflexive) to blow one's nose. (transitive) to blow (someone's) nose. (transitive) to snuff out (a candle etc.). (transitive, colloquial) to put someone in their place.
-oir	French (fr)	A suffix forming infinitives of many verbs. A suffix used on verbs to form masculine words for objects or tools used to do something.. A suffix used on verbs to form masculine words for places where something is done.
mouchoir	French (fr)	Handkerchief.

Mouchoir etymology