Comments:VEWT 218, 243, EDT 608, 665, ЭСТЯ 5, 211-212, 328, Федотов 2, 352, Лексика 107. The original form here is *Kaŕ; a suffixed form was *Kaŕdɨ(ŕ), later simplified to *Kadɨŕ. This can be clearly seen from forms like SUygh. and Khak. Another possible explanation could be an early dissimilation (*Kaŕ-ɨŕ > *Kadɨŕ = *Kaδɨŕ, or already after the zetacism, *Kazɨz > *Kaδɨz). There is some confusion between *Kaŕ and *Kas, *Kasuk in Old Turkic, but MK definitely spells the word as qaz.