Last name Černaj (Černaj 
, Чернай 
) , in the entire world, is a rare cognomen. The last name Černaj is characteristic of Eastern Europe, particularly Slovakia, where it is a rare surname, Ukraine, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Černaj | Slovakia |
| Чернай | Kazakhstan, Russia, Ukraine |
|
emil černaj SK (b. 1923) |
|
| ján černaj medalist (b. 1948) |
|