Last name Ευσταθίου (Efstathiou 
, Eustathiou 
, Ευσταθίου ) , globally, is a common family name. The surname Ευσταθίου is habitual in 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, it most frequently occurs in Greece, Cyprus, and the United States.
| VARIANT | COUNTRY |
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| Efstathiou | United Kingdom, Greece, Germany, United States, Cyprus |
| Eustathiou | United Kingdom, Australia, Poland, Greece, United States |
| Ευσταθίου | Greece |
| μητροπολίτης ευστάθιος ευσταθίου GR (b. 1910) |
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| δημήτρης ευσταθίου GR (b. 1923) |
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| ευστάθιος ευσταθίου Cypriot politician, CY (b. 1935) |
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| αθανάσιος ευσταθίου Greek politician (1939-1982), GR (b. 1939) |
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χρίστος ευσταθίου Cypriot footballer, CY (b. 1990) |
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| κωστής ευσταθίου Cypriot politician, CY (b. 1961) |
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| έλενα ευσταθίου Cypriot actress, CY (b. 1967) |
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| μάνια ευσταθίου GR (b. 1962) |
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| νικηφόρος ευσταθίου GR (b. 1967) |
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| ειρήνη ευσταθίου Greek artist, GR (b. 1980) |
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| ελβίρα ευσταθίου swimmer, GR (b. 1989) |
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| ανδρέας ευσταθίου GR |
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