CEVAP:

The first mention of Turks in the Chinese sources is by Tujue in the sixth century CE. Tujue is the Chinese transcription for the Mongolian word Turkut, plural of Turk, which literally means strong. These Turks, under the leadership of Bumin Khagan (Kaan /Kagan) and his brother Istemi Khagan from the Ashina clan, founded the Kok Turk Empire in the middle of the sixth century. Kok (Gök) had two meanings: blue- sky and east, implying that this was the Empire of the Turks of the East.