羯族の公用語はなんですか？
Another theory claims that a surviving sentence of the Jie language appears to be indicate that it was a Yeniseian language. The reconstructed name "Kiat" (see above) may be cognate with the ethnonyms of Yeniseian-speaking peoples, such as the Ket and the Kott (who spoke the extinct Kott language); however, Vovin et al. (2016) connected the ethnonyms to Proto-Yeniseian *keˀt "person, human being" rather than *qeˀt/s "stone" as proposed by Pulleyblank.
Yeniseian