Cognomen Theodorus (Theodorus 
, Теодор 
, Феодор 
) , in the entire world, is quite a rare last name. The surname Theodorus is habitual in Reunion, where it is quite a common surname, Armenia, where it is quite a rare surname, and Indonesia. Not in comparison with a country's population, it is the most numerous in Indonesia, Spain, and Reunion. More frequently, Theodorus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Theodorus | Germany, Indonesia, South Africa, Spain, Netherlands |
| Теодор | Kazakhstan, Russia, Serbia, Bulgaria, Ukraine |
| Феодор | Kazakhstan, Armenia, Russia, Bulgaria, Ukraine |
Fedor, Feodor, Fiodor, Fiódor, Fjodor, Fyodor, Fëdor, Teodor, Teodoro, Teodors, Theo, Theodor, Theodore, Theodoros, Théodore, Théodoros, Théodorus, Tivadar, Θεόδωρος, Теодоро, Теодорос, Теодору, Теодорус, Тивадар, Тхеодорус, Федор, Федя, Федір, Фьодор, Фёдар, Фёдор, Хведір, פיודור, תאודור, תאודורוס, תיאודור, تئودور, ثيودور, فيودور, and 西奥多
| theunis theodorus South African poet and writer, ZA (b. 1924) |
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| marcus ulpius ofellius theodorus |
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| cyrus theodorus |
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| flavius theodorus |
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