barber (n.)

late 14c., "barb of an arrow," from Old French barbe "beard, beard-like appendage" (11c.), from Latin barba "beard," from Proto-Italic *farfa- "beard," which might be from a common PIE root *bhardhā- "beard" (source also of Old Church Slavonic brada, Russia boroda, Lithuanian barzda, Old Prussian bordus), but according to de Vaan the vowel "rather points to a non-IE borrowing into the European languages."

also barbershop, 1570s, from barber + shop (n.). Earlier in same sense was barbery (c. 1500). Barber-shop in reference to close harmony male vocal quartets is attested from 1910; the custom of barbers keeping a musical instrument in their shops so waiting customers could entertain themselves is an old one, but the musical product formerly had a low reputation and barber's music (c. 1660) was "wretched, poorly performed music."