Cognomen פיודור (Fedor 
, Fiodor 
, Fjodor 
, along with others...) , in the world, is quite a common surname. The surname פיודור is characteristic of Eastern Europe, particularly Slovakia, where it is quite a common surname, Hungary, where it is quite a rare surname, and Moldova. Measured by absolute frequency, it most frequently occurs in the United States, Slovakia, and Hungary. Likewise, פיודור is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fedor | Slovakia, Moldova, United States, Germany, Poland |
| Fiodor | Moldova, United States, Russia, Romania, Poland |
| Fjodor | Serbia, Italy, United States, Germany, Russia |
| Fyodor | Israel, United States, Germany, Belarus, Russia |
| פיודור | Israel |
| Fëdor | Italy |
Fedir, Fedja, Feodor, Fiodar, Fiódor, Fyudor, Teodor, Teodoro, Theo, Theodor, Theodore, Theodoros, Theodorus, Theodōros, Théodore, Théodoros, Tivadar, Θεόδωρος, Теодор, Теодоро, Теодорос, Теодору, Теодорус, Тивадар, Федор, Федя, Федір, Феодор, Фьодор, Фёдар, Фёдор, Хведір, תאודורוס, תיאודור, تيودور, ثيودور, فيودور, 西奥多, and 费杰