Cognomen Orchak (Orchak 
, Оршак 
) , all around the world, is a rare surname. The last name Orchak is habitual in Ukraine, where it is a rare surname, Belarus, and Kazakhstan, where it is a very rare surname. In absolute terms, this name is the most popular in Eastern Europe, particularly Ukraine, Russia, and Belarus.
| VARIANT | COUNTRY |
|---|---|
| Orchak | Mexico, Brazil, United States |
| Оршак | Kazakhstan, Ukraine, Belarus, Russia |