Cognomen Opacki (Opacki 
, Опацький 
) , throughout the world, is a rare last name. The cognomen Opacki is habitual in Ukraine, where it is a rare surname, Poland, and Germany, where it is a very rare surname. In absolute terms, this name is the most popular in Ukraine, Poland, and the United States. Also, Opacki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Opacki | United Kingdom, United States, Germany, Poland, France |
| Опацький | Ukraine |
| zygmunt opacki born:1587|died:1654|; Opacki, Zygmunt; Opacki, Zygmunt, 1587-1655; Opacki, Zygmunt, -1654 (b. 1587) |
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| ireneusz opacki Polish historian, PL (b. 1933) |
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| zbigniew opacki Polish historian, PL (b. 1952) |
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| wojciech opacki |
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| krzysztof opacki |
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| olbracht opacki |
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| samuel franciszek opacki |
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