Comments:A difficult word. On Turk. *josun and Mong. josun see above; Mong. *ǯisü thus seems a better historical match for Turk. *josun. There still remain, however, phonetic problems: in Mong. one would rather expect *ǯüs- or *ǯös-, not *ǯis- (possibly we are dealing with a vocalic metathesis *ǯisü- < *ǯüsi-?); and Evk. ǯesē - although hardly a Mong. loanword because of semantic difference - is also not quite regular (one would expect *ǯis-).