Family name Efstathiou (Efstathiou 
, Ευσταθίου ) , in the world, is a common surname. The cognomen Efstathiou is characteristic of Cyprus, where it is a common surname, Greece, where it is quite a common surname, and Serbia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Greece, Cyprus, and the United States.
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| Efstathiou | United Kingdom, Germany, Greece, Cyprus, United States |
| Ευσταθίου | Greece |
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george j. efstathiou American architect, US |
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| george efstathiou British astronomer, GB (b. 1955) |
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| andreas efstathiou rector, researcher, professor (b. 1963) |
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| georgios efstathiou researcher ORCID ID = 0000-0002-8245-9549 |
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| elias efstathiou Ph.D. Athens University of Economics and Business 2006 |
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| michalis a efstathiou researcher |
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| nikolaos efstathiou researcher |
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| m. efstathiou Ph.D. Imperial College London 1996 |
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| nikolaos e efstathiou researcher |
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| angelos m efstathiou researcher |
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| vasiliki efstathiou Ph.D. University College London 2010 |
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| sophia efstathiou philosopher of science |
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| eleni efstathiou researcher |
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| dionysios efstathiou Ph.D. King's College London 2016 |
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| antonia efstathiou researcher |
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