Surname Наджа (Nadja 
, Najah 
, Nadzha 
) , across the world, is a common cognomen. The cognomen Наджа is characteristic of Maldives, where it is quite a common surname, Morocco, and Tunisia. Measured by absolute frequency, the name is most common in Morocco, Indonesia, and Iraq. More frequently, Наджа is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nadja | Germany, Indonesia, Serbia, United States, Brazil |
| Najah | Germany, Indonesia, Morocco, Syria, Brazil |
| Nadzha | India, Israel, Philippines |
| Наджа | Kyrgyzstan, Russia, Ukraine |