Khan

Khan was a title, mainly used in Central Asia.

Noghai (PROSE: Marco Polo) was a Mongol Lord Khan. (TV: "The Roof of the World")

Hulagu Khan eradicated the Order of the Hashashin. (TV: Marco Polo).

Kublai Khan was the Great Khan, an emperor of the Mongols who ruled over all of Asia in the second half of the 13th century, (TV: Marco Polo, PROSE: Marco Polo)

Khan was also a name. Yasmin Khan was a companion to the Thirteenth Doctor. (TV: The Woman Who Fell to Earth, et al)