Surname Karbaj (Карбай 
, Karbaj 
) , in all the world, is a rare family name. The cognomen Karbaj is characteristic of Lebanon, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Kazakhstan, where it is a very rare surname. Also, Karbaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Карбай | Azerbaijan, Kazakhstan, Russia, Kyrgyzstan, Ukraine |
| Karbaj | Venezuela, Lebanon, United States, United Arab Emirates |