Cognomen Vlachos (Vlachos 
, Βλάχος , Влахос 
) , globally, is a common surname. The family name Vlachos is habitual in Greece, where it is a common surname, Cyprus, where it is quite a common surname, and Serbia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Greece, the United States, and Cyprus.
| VARIANT | COUNTRY |
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| Vlachos | Greece, Australia, Cyprus, United States, Germany |
| Βλάχος | Greece |
| Влахос | Russia, Ukraine |
| georgios vlachos Righteous Among the Nations, GR (b. 1884) |
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| athina vlachos Righteous Among the Nations, GR (b. 1901) |
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william vlachos American football player, US (b. 1988) |
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| jonas vlachos Swedish economist (b. 1970) |
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| tony vlachos American reality TV star, US (b. 1973) |
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| dionisios vlachos US (b. 1964) |
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| georgios vlachos researcher (ORCID 0000-0003-4182-2660) |
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| pavlos vlachos greek-American engineer, scientist, academic, and entrepreneur |
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| evangelos vlachos Argentinian / Greek palaeontologist |
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| sotirios vlachos Greek particle physicist |
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| andreas vlachos researcher, natural language processing, University of Sheffield |
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| michail vlachos researcher ORCID ID = 0000-0003-1008-5290 |
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| michail vlachos Ph.D. University of California, Riverside 2004 |
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| ioannis s. vlachos researcher |
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| evangelos vlachos researcher |
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