Worldwide, Θεοδόσιος (Theodosios 
, Teodosio 
, Théodose 
) is a common primarily masculine, but very infrequently female forename. The forename Θεοδόσιος is habitual in Greece, where it is a common principally masculine, but very infrequently female name, Peru, where it is quite a common masculine name, and Italy, where it is quite a rare male name. Also, Θεοδόσιος is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Theodosios | Italy, Spain, Argentina, Greece, Brazil |
| Teodosio | Spain, Peru, Philippines, Mexico, Brazil |
| Théodose | France, Australia |
| Θεοδόσιος | Greece |
Teodosi, Teodosije, Teodosiu, Teodozio, Teodozjusz, Teodozy, Theodosius, Теодозій, and Феодосий
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θεοδόσιος γ΄ Byzantine Emperor, TR (b. 700) |
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| θεοδόσιος ζυγομαλάς GR (b. 1544) |
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θεοδόσιος δ. ρεβελιώτης (b. 1771) |
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| θεοδόσιος μπότασης Greek warrior during the Greek Revolution of 1821., GR (b. 1794) |
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| θεοδόσιος καρδαράς GR (b. 1800) |
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| θεοδόσιος παπαγιαννακόπουλος GR (b. 1800) |
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| θεοδόσιος β. βενιζέλος (b. 1821) |
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| θεοδόσιος γιάντσιος Greek soldier, GR (b. 1880) |
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θεοδόσιος παυλίδης Greek computer scientist, GR (b. 1934) |
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| θεοδόσιος σπεράντσας Greek publisher (1888-1979), GR (b. 1888) |
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| θεοδόσιος παπαθανασιάδης GR (b. 1898) |
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| θεοδόσιος μαρτζούχος Greek orthodox archimandrite and theologist, GR (b. 1958) |
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| θεοδόσιος υφαντίδης Greek politician, GR |
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| θεοδόσιος β΄ patriarch of Constantinople, GR |
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