All over the world, Athanassios (Athanassios 
, Αθανάσιος ) is quite a rare male forename. The first name Athanassios is habitual in Greece, where it is quite a rare boy's name, Germany, where it is a rare boy's name, and Belgium. Measured by absolute frequency, it is commonest in Greece, Germany, and the United States. Very seldom, Athanassios is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Athanassios | Germany, Greece, South Africa, Brazil, United States |
| Αθανάσιος | Greece |
| athanassios kapolaris Greek metropolitan bishop, GR (b. 1850) |
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| athanassios kontaxis GR (b. 1941) |
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| athanassios e. tzavaras Ph.D. Brown University 1985 (b. 1958) |
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| athanassios skodras researcher ORCID ID = 0000-0002-3872-4325 (b. 1958) |
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| athanassios raftopoulos born:1959-06-05|died:1999|; Raftopoulos, Athanassios 1959- (b. 1959) |
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| athanassios a. argiriou researcher ORCID ID = 0000-0001-6026-9835 (b. 1960) |
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| athanassios vakalis Greek American animator, director, producer, editor, layout artist and storyboard artist, GR (b. 1966) |
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| athanassios briakos GR (b. 1967) |
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| athanassios c. tsikliras ichthyologist |
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| athanassios vratimos researcher |
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| athanassios protopapas researcher |
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| athanassios i philippopoulos researcher |
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| athanassios nicolaides researcher |
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| athanassios g. coutsolelos researcher |
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| athanassios efraimoglou Righteous Among the Nations, GR |
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Manos, Economou, Ververis, Arvanitis, Diamantis, Dimitriou, Galatianos, Tsekouras, Katsioulas, Kosmopoulos, Paraskevas, Theophilis, Michailidis, Sakellariou, Kostopoulos, Papaioannou, Antonopoulos, Panagopoulos, Papadopoulos, Kanellopoulos, Papadimitriou, Papatheodorou, Nikolaou, Tsakiris, Kyriazis, Katsanos, Miras, Dimas, Sakkas, Sakkás, Kontos, Kosmas, Pappas, Diplas, Genita, Giotas, Triantafyllou, Ghikas, Vitkas, Vidras, Voreas, Momtsos, Skalkos, Skonitis, Argiris, Lazarou, Vakalis, Velalis, Liakos, and Panagiotakopoulos