Family name Sierocki (Sierocki 
) , all over the world, is a rare last name. The cognomen Sierocki is habitual in Poland, where it is quite a rare surname, France, where it is a very rare surname, and Germany. Not in comparison with a country's population, the name is most common in Poland, the United States, and Germany. Likewise, Sierocki is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sierocki | Germany, United States, Poland, Argentina, France |
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marek sierocki Polish music journalist, PL (b. 1959) |
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| tadeusz sierocki (b. 1929) |
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| ireneusz sierocki Polish philosopher (1949-2015), PL (b. 1949) |
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| zbigniew sierocki Polish ice hockey player, PL (b. 1975) |
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| michał sierocki Polish athletics competitor, PL (b. 1999) |
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