In the world, Sidja (Sidja 
) is a very rare unisex first name. The forename Sidja is characteristic of Indonesia, where it is a very rare male name, and Brazil, where it is a very rare female name. More prevalently, Sidja is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sidja | Indonesia, Brazil, South Africa |