Comments:EAS 46, 97, KW 158, Poppe 95, VEWT 221, АПиПЯЯ 288, Лексика 96-97. A Western isogloss. PT -j- instead of the expected -d- is baffling (cf. TMN 1, 394, 3, 566); perhaps OT qaja is a borrowing from some archaic "j-dialect"? Helimski 1995 proposed a Sam. etymology for the Turkic word (PS *koǝjǝ 'mountain'), which cannot be excluded. But obviously Mong. is not < Turk. (despite Щербак 1997, 132). Cf. also a toponym: OT Ezgenti qadaz = Mong. Ergenetü qada].