Cognomen Opak (Opak 
, Опак 
) , all around the world, is quite a rare family name. The family name Opak is habitual in Turkey, where it is quite a rare surname, Malaysia, where it is a rare surname, and Ukraine, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Turkey, Indonesia, and Malaysia. Very seldom, Opak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Opak | Malaysia, Indonesia, India, Poland, Turkey |
| Опак | Ukraine, Russia |