Cognomen Γιαννακόπουλος (Giannakopoulos 
, Γιαννακόπουλος , Geanakoplos ) , in the world, is a common family name. The surname Γιαννακόπουλος is characteristic of Greece, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Australia, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Greece, Germany, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Giannakopoulos | Germany, Canada, Australia, United States, Greece |
| Γιαννακόπουλος | Greece |
| Geanakoplos | United States |
| Yiannakopoulos | United Kingdom, Canada, Australia, United States, Greece |
| ιωάννης γιαννακόπουλος Greek politician, GR (b. 1834) |
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ιωήλ γιαννακόπουλος Greek orthodox priest and writer, GR (b. 1901) |
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| νικόλαος γιαννακόπουλος Greek politician, GR (b. 1894) |
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| χρήστος γιαννακόπουλος Greek screenwriter, journalist and writer, GR (b. 1909) |
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| γιώργος γιαννακόπουλος Greek writer, journalist and lyricist, GR (b. 1915) |
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στέλιος γιαννακόπουλος Greek footballer and manager, GR (b. 1974) |
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| παύλος γιαννακόπουλος Greek businessman, GR (b. 1929) |
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| θανάσης γιαννακόπουλος Greek businessman, GR (b. 1931) |
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| γεώργιος γιαννακόπουλος Greek association football player (1941-2010), GR (b. 1941) |
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| γιάννης γιαννακόπουλος Greek association football player (1945-2009), GR (b. 1945) |
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| δημήτρης γιαννακόπουλος Greek businessman, GR (b. 1974) |
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| ανδρέας γιαννακόπουλος Greek actor, GR |
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| δημήτρης γιαννακόπουλος Greek actor, GR |
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| κωνσταντίνος γιαννακόπουλος Greek painter, GR |
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| κωνσταντίνος γιαννακόπουλος Greek actor, GR (b. 1980) |
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Ιωάννης, Θοδωρής, Νίκος, Αλέξανδρος, Γιώργος, Βασίλης, Γιάννης, and Κωνσταντίνος