бяруу • (bjaruu) (Mongolian spelling ᠪᠢᠷᠠᠭᠤ)
Inherited from Proto-Mongolic *biraxu, thought to be a borrowing from Proto-Turkic *buŕagu (“calf”). Compare Old Turkic 𐰉𐰆𐰕𐰍𐰆 (buzaɣu), Turkish buzağı, Hungarian borjú.