Kumo Xi
As for the exonym "Tatabï" given to Kumo Xi by Göktürks, Zuev (2002) compares "Tatabï" to Avestan "tata apo" and proposes an etymology from Iranic *"tata-api" "falling waters", after having noted that the name of a Xī-(奚)-associated tribe "Bái-Xí" 白霫 (&lt; MC *"bˠæk̚-ziɪp̚") literally meant "white downpour/torrent" in Chinese, and that the Xī (奚) and Xí (霫) occupied the same area, Zhongjing (中京).