Комментарии:A possible derivative is PA *keju-ŕ(ga) 'kettle': PT *Kāŕgan (ЭСТЯ 5, 186-188 - a contraction < *Kaj-rgan ?); Mong. kaji-sun ( < *kajir-sun); PTM *kejren (ТМС 1, 444); see KW 169; ЭСТЯ 5, 188. In that case PA *k- should be reconstructed.