Cognomen Сирак (Sirak 
, Сирак 
, Cirac 
) , in all the world, is quite a common surname. The family name Сирак is habitual in Armenia, where it is quite a common surname, Ethiopia, where it is quite a rare surname, and Estonia. In absolute terms, it most frequently occurs in Ethiopia, the United States, and Armenia. Also, Сирак is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sirak | Ethiopia, Thailand, Sudan, United States, India |
| Сирак | Russia, Bulgaria, Kazakhstan, Ukraine, Armenia |
| Cirac | Germany, Spain, United States, Italy, India |
| Syrak | Denmark, United States |