Where does “بازو” come from?

بازو (Persian) comes from Old Persian 𐎲𐎠𐏀𐎢, from Proto-Iranian baHjúh, from Proto-Indo-Iranian bʰaHȷ́ʰúš, from Proto-Indo-European bʰāǵʰus — arm.

بازو (Persian): upper arm; arm