Occurrence and application in linguistics the term Chagatai language

Chagatai writing made a great contribution to the formation and development of culture in the history of Turkic-speaking peoples. Therefore, this article has studied the origin of the anthroponym Chagatai, used by the Turkic-speaking States during the XV-XIX centuries, and its use as a term in scientific works At the time, these issues generated a great interest of Soviet turkologists, and some domestic and Russian-speaking scientists conducted research in this direction, that is, they studied the language of official documentation and written monuments of the XV-XIX centuries. This article gave examples from their writings. In the works it was noted that Chagatai language was the literary language of the Turkic-speaking peoples in the territory belonging to Chagataikhan, the second son of Genghis Khan, after his death. Since then, the anthroponym Chagatai has been widely used as a term in scientific works, subsequently there were such terms as Chagatai writing, Chagatai language, Chagatai culture, Chagatai literature...