Surname Niaj (Niaj 
) , around the globe, is a rare family name. The surname Niaj is habitual in Lebanon, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Bangladesh. Not in comparison with a country's population, it is the most numerous in Bangladesh, India, and Lebanon. More frequently, Niaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niaj | Bangladesh, United Arab Emirates, India, Lebanon, Saudi Arabia |