Surname Viun (Viun 
, Вьюн 
, Виун ) , globally, is a rare cognomen. The family name Viun is habitual in Belarus, where it is quite a rare surname, Lithuania, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Russia, Belarus, and Ukraine. Much less frequently, Viun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Viun | Lithuania, Ukraine, India |
| Вьюн | Belarus, Ukraine, Russia, Kazakhstan |
| Виун | Russia |