Last name Kotlarz (Kotlarz 
) , all over the world, is quite a rare cognomen. The surname Kotlarz is habitual in Poland, where it is quite a rare surname, Norway, where it is a rare surname, and Ireland. Measured by absolute frequency, this name is the most popular in Poland, the United States, and Germany. Likewise, Kotlarz is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kotlarz | Germany, United Kingdom, United States, Poland, Canada |
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roman kotlarz Polish priest and activist, PL (b. 1928) |
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piotr wojciech kotlarz Polish politician, PL (b. 1951) |
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| serge koster vel kotlarz FR (b. 1940) |
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| joe kotlarz American lawyer and politician, US (b. 1956) |
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| krzysztof kotlarz researcher |
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| daniel kotlarz researcher |
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| nadine kotlarz researcher |
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| piotr kotlarz Ph.D. Instytut Podstawowych Problemów Techniki PAN 2008 |
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