Surname Gaak (Gaak 
, Гаак 
) , around the world, is quite a rare family name. The cognomen Gaak is characteristic of Kazakhstan, where it is quite a rare surname, Belarus, where it is a rare surname, and Kyrgyzstan. In absolute terms, this name is the most popular in Russia, Kazakhstan, and Ukraine. Very seldom, Gaak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gaak | Egypt, Russia, Democratic Republic of the Congo, China, Germany |
| Гаак | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |