Surname Čaj (茶 
, Çay 
, Čaj 
) , in the world, is a common last name. The surname Čaj is habitual in Turkey, where it is quite a common surname, China, where it is quite a rare surname, and Saudi Arabia, where it is a rare surname. Also, Čaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 茶 | China |
| Çay | Saudi Arabia, Turkey, United States, China, Germany |
| Čaj | Czechia |