Fwiw:
Khan
Meaning & Origin:
The ancient surname Khan is a contracted form of Khagan, from the Turkish khan meaning “chief or ruler.” It was originally a hereditary title born by early Mongol leaders, such as the legendary Genghis Khan, but is now widely used as a surname throughout the Muslim world. Khan is an especially common surname in South Asian Muslim families, and is also one of the most common surnames in Pakistan.
https://www.thoughtco.com/khan-name-meaning-and-origin-1422541
Thanks for the info ...