Globally, Oiuna (Оюна 
, Оиуна , Oiuna 
) is a rare female first name. The first name Oiuna is habitual in Eastern Europe, particularly Russia, where it is a rare feminine name. Very seldom, Oiuna is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Оюна | Ukraine, Russia, Kyrgyzstan |
| Оиуна | Russia |
| Oiuna | Russia, Georgia |