бух • (buh) (Mongolian spelling ᠪᠤᠬᠠ); (hidden-n declension )
бух • (bux)
From Proto-Mongolic *buka, a borrowing from Proto-Turkic *buka. Compare Old Turkic 𐰉𐰆𐰸𐰀 (buqa, “bull”), Turkish boğa.
Possibly related to буга (buga, “stag”)