Surname Гладуниак (Гладуниак 
) , in all the world, is an extremely rare family name. The last name Гладуниак is characteristic of Eastern Europe, particularly Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Гладуниак | Russia |
Gladouniak, Gladuniak, Gladunyak, Hladuniak, and Hladunyak