Family name Nitraj (Nitraj 
, Нитрай 
) , around the globe, is a very rare cognomen. The cognomen Nitraj is habitual in Croatia, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Likewise, Nitraj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nitraj | India, Croatia |
| Нитрай | Russia, Ukraine |