The origin of the ancient Mongolian terms Kiyan and Kiyat

An undeveloped problem of the origin of the ancient Mongolian terms Kiyan and Kiyat was studyed in the article. The argyments given by the author leave no trace of doubt that the names are etimologically connected with the ethnonym Mongol. The research is in close contact with the problem of Ergune-kune, which is one of the most important Mongol studies in the world.