Many settlements recorded in medieval sources have names derived from the ethnonym Chigil, such as Chigil-kant and Chigil-balyk in Xinjiang, and Chigil in the Zhetysu area:Sh. Kamoliddin, "Ancient Türkic Toponyms of the Middle Asia", Tashkent, Shark, 2006, p. 42 (in Russian, no ISBN) During the Middle Ages, a city, Yar, is mentioned as located on the southern bank of lake Issyk-kul. This city is the capital of the leader of the Djikil (i.e. Chigil) tribe.Sh. Kamoliddin, "Ancient Türkic Toponyms of the Middle Asia", Tashkent, Shark, 2006, p. 92 The city retained its name in the form Chal till present. The various forms of this toponym (Shiyan, Shal, Chal) come from the Turkic ethnonym Chiyal (i.e. Chigil).Sh. Kamoliddin, "Ancient Türkic Toponyms of the Middle Asia", Tashkent, Shark, 2006, p. 126
