Last name Киряк (Киряк 
, Kiriak 
, Kiryak 
) , across the world, is a rare surname. The last name Киряк is characteristic of Bulgaria, where it is quite a rare surname, Georgia, and Moldova. Not in comparison with a country's population, this name is the most popular in Bulgaria, Hungary, and Georgia. Likewise, Киряк is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Киряк | Kazakhstan, Russia, Bulgaria, Ukraine |
| Kiriak | Moldova, Bulgaria, Georgia, United States, Hungary |
| Kiryak | Thailand, United States, Russia, Turkey, Ukraine |
| Kirjak | Canada, Norway, United States, Hungary |