"The word “moustache” derives from 16th century French moustache, which in turn is derived from the
Italian mostaccio (14th century), dialectal
mustaccio (16th century), from
Medieval Latin mustacium (8th century),
Medieval Greek μουστάκιον (
moustakion), attested in the 9th century, which ultimately originates as a diminutive of
Hellenistic Greek μύσταξ (
mustax,
mustak-), meaning “upper lip” or “facial hair”,
[2] probably derived from Hellenistic Greek μύλλον (
mullon), “lip”."