Surname Cieslak (Cieslak 
) , globally, is a common cognomen. The last name Cieslak is characteristic of Poland, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Ireland. Not in comparison with a country's population, it most frequently occurs in Poland, the United States, and Brazil. More prevalently, Cieslak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cieslak | Poland, Brazil, France, Germany, United States |
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jürgen cieslak German stove builder and heritage preservator, DE (b. 1942) |
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| ted cieslak baseball player (1912-1993), US (b. 1912) |
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| johannes cieslak DE (b. 1914) |
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brad cieslak player of American football, US (b. 1982) |
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| richard m. cieslak victim of the COVID-19 pandemic: Successful business owner in construction and recycling., US (b. 1943) |
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| dirk cieslak (b. 1954) |
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| celso cieslak Brazilian politician, BR (b. 1967) |
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| paul r. cieslak researcher |
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| agata cieslak researcher (ORCID 0000-0003-1015-9448) |
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| michael cieslak researcher |
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| anja cieslak German entomologist, DE |
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| adam cieslak researcher ORCID ID = 0000-0001-7518-579X |
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| matthew cieslak researcher |
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| jakub cieslak researcher ORCID ID = 0000-0001-6936-2550 |
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| fabrício cieslak researcher |
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