Latin word minor comes from Ancient Greek (to 1453) μνᾶ

Detailed word origin of minor

Dictionary entry	Language	Definition
μνᾶ	Ancient Greek (to 1453) (grc)
mina	Latin (lat)	(figuratively) threats, menaces. Projecting points, pinnacles, battlements, parapets A Greek silver coin equal to 100 drachmas. A Greek weight equal to 100 drachmas.
minor	Latin (lat)	(with dative) I threaten, menace someone with something. I jut forth, protrude, project.