Surname Jjun (Йун 
, Jjun 
) , worldwide, is a very rare last name. The surname Jjun is habitual in Ukraine, where it is an extremely rare surname, Russia, and China. Much more prevalently, Jjun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Йун | Ukraine, Russia |
| Jjun | China |