Where does “μπάρμπας” come from?

μπάρμπας (Greek) comes from Byzantine Greek μπάρμπας, from Italian barba, from Medieval Latin barbas, from Latin barba, from Latin farba, from Proto-Italic farβā, from Proto-Indo-European bʰardʰéh₂ — beard.

μπάρμπας (Greek): uncle brother of one's father or mother