Family name سيدور (Sidor 
, Sydor 
, سيدور 
) , across the world, is quite a common surname. The surname سيدور is characteristic of Eastern Europe, particularly Slovakia, where it is quite a common surname, Poland, where it is quite a rare surname, and Romania. Measured by absolute frequency, it is commonest in Poland, the United States, and Romania. Also, سيدور is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sidor | Brazil, Poland, Romania, United States, Slovakia |
| Sydor | Brazil, Poland, France, Canada, United States |
| سيدور | Sudan |
| Cedor | Brazil, Poland, Canada, United States, Germany |