Worldwide, Ευθύμιος (Efthymios 
, Efthimios 
, Ευθύμιος ) is a common masculine given name. The first name Ευθύμιος is characteristic of Greece, where it is a common masculine name, Cyprus, where it is quite a rare boy's name, and Germany, where it is a rare male name. Not in comparison with a country's population, it most frequently occurs in Greece, Germany, and the United States. Also, Ευθύμιος is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Efthymios | Germany, Greece, Cyprus, United States, United Kingdom |
| Efthimios | Germany, Australia, Greece, Cyprus, United States |
| Ευθύμιος | Greece |
| Euthymios | South Africa, Brazil, United States, Venezuela |
| ευθύμιος μαλάκης GR (b. 1115) |
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ευθύμιος καστόρχης Greek classical philologist and university professor, GR (b. 1810) |
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ευθύμιος χατζηπέτρος Greek soldier, GR (b. 1833) |
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ευθύμιος καράκαλος Greek writer and politician, GR (b. 1836) |
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ευθύμιος καούδης Greek revolutionary, GR (b. 1866) |
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ευθύμιος αγριτέλης Greek cleric, GR (b. 1876) |
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ευθύμιος πολ. αγγελιδάκης Greek lawyer and judge (1912-1988), GR (b. 1912) |
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ευθύμιος μαστροκώστας Greek archaeologist, GR (b. 1915) |
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| ευθύμιος κανελλόπουλος Greek diplomat 1872-1933, GR (b. 1876) |
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| ευθύμιος τσιμικάλης Greek soldier, GR (b. 1879) |
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| ευθύμιος κοτζαμπασούλης Greek architect, GR (b. 1880) |
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ευθύμιος στοφορόπουλος Greek diplomat, GR (b. 1940) |
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ευθύμιος καραμήτσος German karateka, GR (b. 1956) |
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| ευθύμιος καμουτσής Greek police officer, GR (b. 1908) |
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| ευθύμιος δάλκας Greek historian, GR (b. 1909) |
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