Cognomen Mysun (Mysun 
, Мисун 
) , all around the world, is a rare last name. The cognomen Mysun is characteristic of Belarus, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Russia. In absolute terms, this name is the most popular in Russia, Belarus, and China. Very seldom, Mysun is the forename as well as the last name.