Mahmud al-Kashgari
The Chuyue (處月) were often identified with the "Čigil", a Middle Turkic-speaking tribe "opposing Rūm" mentioned by 10th century Karakhanid scholar Mahmud al-Kashgari; still, Atwood (2010) doubts this Chuyue-Chigil identification and notes that Chuyue is phonetically closer to the Chunghyl "bones" of the Yugurs.