Cognomen Iun (Iun 
, Йун 
, Юн 
) , all around the world, is quite a common family name. The last name Iun is characteristic of Macao, where it is quite a common surname, Armenia, and Kazakhstan, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Russia, Kazakhstan, and Kyrgyzstan. Also, Iun is the forename as well as the last name.