Cognomen Szun (Сунь 
, Szun 
) , in all the world, is a rare family name. The last name Szun is habitual in Kyrgyzstan, where it is a rare surname, Ukraine, and Kazakhstan. Not in comparison with a country's population, it most frequently occurs in Russia, Ukraine, and Kazakhstan. Very seldom, Szun is the forename as well as the last name.