Surname Цаюн (Цаюн 
) , globally, is a rare family name. The cognomen Цаюн is habitual in Belarus, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. In absolute terms, it is commonest in Belarus, Kazakhstan, and Russia. Very seldom, Цаюн is the forename as well as the last name.