Last name Kopecki (Kopecki 
) , in the entire world, is quite a rare cognomen. The cognomen Kopecki is habitual in Croatia, where it is quite a rare surname, Poland, where it is a rare surname, and Germany. Measured by absolute frequency, it is commonest in Poland, the United States, and Germany. Likewise, Kopecki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kopecki | Brazil, United States, Germany, Poland, Croatia |
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stefan kopecki Polish officer, UA (b. 1895) |
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józef kopecki Major of the Polish Army, CZ (b. 1895) |
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kazimierz kopecki PL (b. 1904) |
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| maciej kopecki Polish graphic designer and engraver, designer of postage stamps and banknotes, PL (b. 1945) |
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| steffen kopecki Dr. rer. nat. Universität Stuttgart 2011 |
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| zlatko kopecki researcher ORCID ID = 0000-0002-8072-4222 |
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