Last name Siedlecki (Siedlecki 
) , all around the world, is quite a rare family name. The family name Siedlecki is characteristic of Poland, where it is quite a rare surname, the United States, where it is a rare surname, and Canada. Measured by absolute frequency, it is commonest in Poland, the United States, and Brazil. Also, Siedlecki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siedlecki | Germany, United States, Poland, Canada, Brazil |
| stanisław siedlecki PL (b. 1676) |
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józef wojciech siedlecki Polish painter, PL (b. 1841) |
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franciszek siedlecki Polish Painter and Graphic Artist (1867-1934), PL (b. 1867) |
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michał siedlecki zoologist, PL (b. 1873) |
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stanisław siedlecki Polish politician, PL (b. 1877) |
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stanisław maria tytus siedlecki (b. 1869) |
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| jan siedlecki PL (b. 1829) |
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| stanisław siedlecki PL (b. 1840) |
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zygmunt siedlecki Polish athlete, PL (b. 1907) |
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| theophil siedlecki DE (b. 1874) |
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| ludwik siedlecki (b. 1878) |
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| luise christine siedlecki DE (b. 1884) |
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| julian siedlecki Polish military, major of the Polish Army (1896–1939), PL (b. 1896) |
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| feliks siedlecki (b. 1890) |
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| izydor siedlecki Polish Righteous Among the Nations, PL (b. 1900) |
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