Cognomen Клун (Klun 
, Клун 
) , in the entire world, is quite a rare surname. The family name Клун is habitual in Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Bulgaria, where it is a rare surname. In absolute terms, it is the most numerous in Slovenia, the United States, and Italy. Very seldom, Клун is the forename as well as the last name.