Cognomen นัตจา (Natja 
, นัตจา 
) , in the world, is a rare surname. The surname นัตจา is habitual in Indonesia, where it is a very rare surname, Spain, and Venezuela, where it is an extremely rare surname. More frequently, นัตจา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Natja | Denmark, Germany, Puerto Rico, Indonesia, Slovenia |
| นัตจา | Thailand |