Cognomen Sildoja (Sildoja 
) , worldwide, is a very rare last name. The cognomen Sildoja is habitual in Estonia, where it is quite a rare surname, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sildoja | Canada, Estonia |
| raivo sildoja Estonian musician, EE (b. 1970) |
|