Last name Фьодор (Fedor 
, Fiodor 
, Feodor 
, among others...) , in the world, is a common cognomen. The cognomen Фьодор is characteristic of Eastern Europe, particularly Slovakia, where it is quite a common surname, Hungary, and Moldova, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in the United States, Slovakia, and Hungary. Also, Фьодор is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Fedor | Germany, Slovakia, Moldova, United States, Poland |
| Fiodor | Russia, Romania, Moldova, United States, Poland |
| Feodor | Germany, Romania, Moldova, United States, Hungary |
| Fjodor | Germany, Russia, Serbia, United States, Italy |
| Fyodor | Germany, Russia, Belarus, United States, Israel |
| Фьодор | Bulgaria, Russia, Ukraine |
Fedir, Fedja, Fiodar, Fiódor, Fjodors, Fodor, Fëdor, Teodor, Teodoro, Teuvo, Theo, Theodor, Theodore, Theodoros, Theodorus, Theodōros, Théodore, Théodoros, Tivadar, Θεόδωρος, Теодор, Теодоро, Теодорос, Теодору, Теодорус, Тивадар, Федор, Федя, Федір, Феодор, Фёдар, Фёдор, Хведір, פיודור, תאודורוס, תיאודור, تيودور, ثيودور, فيودور, 西奥多, and 费杰