Cognomen ثيودور (Teodoro 
, Theodore , Theodor ) , all around the world, is a widespread family name. The last name ثيودور is characteristic of Saint Lucia, where it is a common surname, Dominica, where it is quite a common surname, and Spain (explore the name in all countries). In absolute terms, this name is the most popular in Brazil, Mexico, and Spain. Likewise, ثيودور is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Teodoro, Theodor, Theodore | Brazil, Germany, United States, Mexico, Philippines |
| ثيودور | Iraq, Palestinian Territory |
Fedir, Fedor, Feodor, Fiodor, Fiódor, Fjodor, Fyodor, Fëdor, Teodor, Teodors, Teuvo, Th., Theo, Theodoor, Theodoro, Theodoros, Theodorus, Theodōros, Théodore, Théodoros, Tivadar, Θεόδωρος, Теодор, Теодоро, Теодорос, Теодору, Теодорус, Тивадар, Федор, Федя, Федір, Феодор, Фьодор, Фёдар, Фёдор, Хведір, פיודור, תאודור, תאודורוס, תיאודור, تيودور, فيودور, and 西奥多