Surname Njaja (Njaja 
) , throughout the world, is a very rare cognomen. The family name Njaja is characteristic of South Africa, where it is a very rare surname, Indonesia, and Nigeria, where it is an extremely rare surname. Much less frequently, Njaja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Njaja | Indonesia, South Africa, India, United States, Nigeria |