Middle English word monk comes from Proto-Indo-European *memóne (To remember. To think, to be mindful.), Proto-Indo-European *moy-

Detailed word origin of monk

Dictionary entry	Language	Definition
*memóne	Proto-Indo-European (ine-pro)	To remember. To think, to be mindful.
*moy-	Proto-Indo-European (ine-pro)
μόνος	Ancient Greek (grc)
μοναχός	Ancient Greek (grc)
monachus	Latin (lat)	(Medieval Latin) monk (male member of a religious community).
monachus	Late Latin (LL)
munuc	Old English (ang)	Monk.
monk	Middle English (enm)	Monk.

Words with the same origin as monk