From Proto-Mongolic *belcixer (compare Dongxiang banche), a derivation from the ancestor of бэлчих (belčix, “to graze”).
Ultimately, probably from *bel, for which see бэл (bel, “slope”).
бэлчээр • (belčeer) (Mongolian spelling ᠪᠡᠯᠴᠢᠭᠡᠷ (belčiger)); (regular declension)