Ab`l-Khayr Khan

(from the article `Uzbekistan`) ...northwestern Siberia, where they probably adopted the name Uzbek from the admired Muslim ruler of the Golden Horde, Öz Beg (Uzbek) Khan (reigned ... ...is wrapped in obscurity, but by the mid-15th century they had migrated from their original homeland, east of the Ural Mountains, southeast toward ...
Found on http://www.britannica.com/eb/a-z/a/8
No exact match found