Cognomen Βλάχος (Vlahos 
, Βλάχος , Blachos 
) , throughout the world, is quite a rare last name. The last name Βλάχος is habitual in Greece, where it is quite a rare surname, North Macedonia, and Bulgaria. Measured by absolute frequency, the name is most common in the United States, Australia, and Greece.
| VARIANT | COUNTRY |
|---|---|
| Vlahos | Canada, Australia, Bulgaria, United States, Greece |
| Βλάχος | Greece |
| Blachos | Mexico, Greece, United States |
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γεράσιμος βλάχος Greek renaissance humanist, GR (b. 1607) |
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σταύρος βλάχος Greek politician, GR (b. 1802) |
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άγγελος βλάχος Greek politician and writer, GR (b. 1838) |
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σπυρίδων βλάχος Eastern Orthodox archbishop, GR (b. 1873) |
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| γεώργιος βλάχος Greek lawyer and politician, GR (b. 1873) |
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| ιωάννης βλάχος Greek politician, GR (b. 1880) |
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| γεώργιος βλάχος Greek journalist and publisher (1886–1951), GR (b. 1886) |
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| σταύρος βλάχος (b. 1883) |
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γιώργος βλάχος Greek association football player, GR (b. 1943) |
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| νικόλαος βλάχος Greek historian and university professor, GR (b. 1893) |
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μητροπολίτης ναυπάκτου και αγ. βλασίου ιερόθεος βλάχος Greek bishop of Nafpaktos and Agios Vlasios, GR (b. 1945) |
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γιώργος βλάχος Greek politician, GR (b. 1953) |
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| γεώργιος βλάχος Greek university professor and jurist (1912-1996), GR (b. 1912) |
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δημήτρης βλάχος Greek goldwork embroiderer, GR (b. 1965) |
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| άγγελος σ. βλάχος Greek writer and diplomat, GR (b. 1915) |
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