Around the world, Efthymios (Efthymios 
, Ευθύμιος ) is a common boy's forename. The first name Efthymios is habitual in Greece, where it is a common male name, Cyprus, where it is quite a rare boy's name, and the United Kingdom, where it is a very rare masculine name. In absolute terms, this name is the most popular in Greece, Cyprus, and the United States. Likewise, Efthymios is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Efthymios | United Kingdom, Greece, Cyprus, United States, Sweden |
| Ευθύμιος | Greece |
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efthymios mitropoulos Secretary General of the International maritime Organisation, GR (b. 1939) |
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efthymios warlamis Greek-Austrian architect and artist, AT (b. 1942) |
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efthymios nicolaidis (b. 1954) |
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| efthymios g. tsionas economist (Lancaster University) (b. 1965) |
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| efthymios kalaras Greek Paralympian, GR (b. 1976) |
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| efthymios papadopoulos researcher ORCID ID = 0000-0002-4050-8701 |
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| efthymios sofos Ph.D. University of Bristol 2015 |
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| efthymios angelakis researcher |
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| efthymios fidanis researcher |
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| efthymios iliopoulos researcher |
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| efthymios kantarelis researcher ORCID ID = 0000-0001-9831-6633 |
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| efthymios hadjimichael researcher, ORCID id # 0000-0002-4622-1488 |
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| efthymios avgerinos researcher |
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| efthymios klampaftis researcher, ORCID id # 0000-0001-6924-3973 |
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| efthymios n deliargyris researcher |
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