Cognomen Будиак (Budyak 
, Будиак , Budiak 
) , all over the world, is a rare last name. The last name Будиак is characteristic of Slovakia, where it is quite a rare surname, Lithuania, where it is a rare surname, and Poland, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Indonesia, Russia, and Slovakia.
| VARIANT | COUNTRY |
|---|---|
| Budyak | Italy, Russia, United States, Lithuania, Spain |
| Будиак | Russia |
| Budiak | Slovakia, Ukraine, Lithuania, Poland, Indonesia |