Family name Sjun (Sjun 
, Сюн 
) , across the world, is a very rare surname. The last name Sjun is habitual in Kyrgyzstan, where it is a very rare surname, Kazakhstan, and Ukraine. Not in comparison with a country's population, it is the most numerous in Russia, China, and Ukraine. More prevalently, Sjun is the forename as well as the last name.