Surname Siwecki (Siwecki 
) , around the globe, is a rare family name. The last name Siwecki is habitual in Poland, where it is a rare surname, Argentina, where it is a very rare surname, and the United Kingdom. In absolute terms, this name is the most popular in Poland, the United States, and the United Kingdom. Also, Siwecki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siwecki | United Kingdom, Poland, Argentina, Germany, United States |
| alojzy siwecki painter (1912-1988), UA (b. 1912) |
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| jerzy leon siwecki PL (b. 1908) |
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| ryszard siwecki Polish botanist and dendrologist (1939-2002), PL (b. 1939) |
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| leon siwecki Polish teacher, PL (b. 1950) |
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| jacek siwecki Polish cinematographer, PL (b. 1952) |
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| piotr siwecki (b. 1971) |
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