Family name Kostopoulos (Kostopoulos 
, Κωστόπουλος ) , globally, is quite a common cognomen. The last name Kostopoulos is habitual in Greece, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Australia, where it is a rare surname. In absolute terms, it most frequently occurs in Greece, the United States, and Australia.
| VARIANT | COUNTRY |
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| Kostopoulos | Germany, Greece, Australia, Canada, United States |
| Κωστόπουλος | Greece |
Κωστοπουλος, Костопоулос, and Костопулос
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tom kostopoulos ice hockey player, CA (b. 1979) |
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aleksander kostopoulos Norwegian musician, drummer (b. 1987) |
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evan kostopoulos Australian soccer player, AU (b. 1990) |
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| george k. kostopoulos (b. 1939) |
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| kristin kostopoulos Norwegian musician (b. 1963) |
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| tasos kostopoulos greek historian (b. 1965) |
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| epameinondas kostopoulos researcher |
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| athanasios kostopoulos (b. 1970) |
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| spiros kostopoulos researcher |
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| ioannis kostopoulos researcher |
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| aristotelis e. kostopoulos Ph.D. University of Patras 2012 |
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| andreas k. kostopoulos researcher |
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| vassilis kostopoulos researcher (ORCID 0000-0003-0051-0732) |
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| vassilis kostopoulos Ph.D. University of Patras 1988 |
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| zachary l. kostopoulos |
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