Myths and legends have arisen as a result of human weakness in the face of natural phenomena and changes in the world. The emergence did not stop in modern times. New Uzbek myths and legends appeared during the period of the Islamic conquest. Myths are characteristic of the fact that once people believed in these phenomena. Today, thanks to the achievements of the human mind, many changes in nature have been studied, and it has become known that those told in myths are far from reality. People do not live in fear of mythical images. The names of mythical images, that is, mythonyms, refer to little used vocabulary. Mythonyms express lexical concepts characteristic of the language of myths. The article examines the origin and emergence of new Uzbek myths and legends of the Islamic period, as well as some mythonyms studied in Uzbek linguistics.