Cognomen Δούκα (Duca 
, Douka 
, Δούκα ) , all over the world, is a common family name. The surname Δούκα is habitual in Malta, where it is quite a common surname, Moldova, and Aland Islands (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Romania, Italy, and Greece. Much less frequently, Δούκα is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duca | Italy, Philippines, Brazil, Greece, Romania |
| Douka | France, United States, Brazil, Greece, Democratic Republic of the Congo |
| Δούκα | Greece |
| μάρω δούκα Greek writer, GR (b. 1947) |
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| ζέτα δούκα Greek actress, GR (b. 1973) |
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| αθηνά δούκα Greek sport shooter, GR (b. 1976) |
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| αναστασία δούκα Greek artist, GR (b. 1979) |
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| νανά δούκα Greek actress, GR |
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| λίτσα δούκα Greek actress, GR |
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| κατερίνα δούκα archaeological scientist, GR (b. 1981) |
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