Khan (/xɑːn/) is an ancient Indo-European surname and in the variant of 'Khan' of Turkic and Mongolian origin, used as a title in various global regions, and today most commonly found in parts of Pakistan, Afghanistan, India, Bangladesh, Iran, Eastern Europe, Uzbekistan and Russia.
In the Caribbean the surname is largely carried by Muslims of Indo-Caribbean descent. It is derived from the historic title khan, referring to military chief or royalty. It originated as a hereditary title among nomadic tribes in the Central and Eastern Eurasian Steppe during antiquity and was popularized by Afghan dynasties in the rest of Asia as well as in Eastern Europe during the medieval period.