Cognomen نينجا (Ninja 
, نينجا 
, Nindja 
) , in the world, is quite a rare surname. The cognomen نينجا is habitual in Trinidad and Tobago, where it is quite a rare surname, Serbia, and Sudan, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Egypt, and Sudan. Also, نينجا is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ninja | Taiwan, Nepal, Indonesia, Germany, Algeria |
| نينجا | Saudi Arabia, Egypt, Morocco, Algeria, Sudan |
| Nindja | Algeria, United States |