Cognomen Ольгаа (Ольгаа 
, Olgaa 
) , throughout the world, is a rare last name. The last name Ольгаа is habitual in Indonesia, where it is a very rare surname, and Venezuela, where it is an extremely rare surname. Much less frequently, Ольгаа is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ольгаа | Russia, Kazakhstan |
| Olgaa | Mexico, Italy, India, Spain, Indonesia |