Cognomen Оля (Оля 
, Olja 
, Olia 
) , all around the world, is a common family name. The last name Оля is characteristic of Georgia, where it is quite a common surname, Moldova, and Belarus. Not in comparison with a country's population, the name is most common in Russia, Georgia, and Belarus. More prevalently, Оля is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Оля | Russia, Belarus, Kazakhstan, Georgia, Moldova |
| Olja | Bosnia and Herzegovina, Russia, Indonesia, Serbia, Belarus |
| Olia | Russia, Belarus, Georgia, Moldova, India |
| Olya | Russia, Indonesia, Belarus, Moldova, India |