Last name Kostowski (Kostowski 
) , in the entire world, is a rare cognomen. The cognomen Kostowski is characteristic of Czechia, where it is a rare surname, Poland, and New Zealand. Not in comparison with a country's population, it most frequently occurs in Poland, Czechia, and Germany. Also, Kostowski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kostowski | Germany, Czechia, Australia, United States, Poland |
| wojciech kostowski Polish pharmacologist, PL (b. 1939) |
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| jakub kostowski Jakub Kostowski * 1958 , † 2006 , historian nationality: Polish sex: male notes: NKP ne 2018/09 (b. 1958) |
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| grzegorz jerzy kostowski |
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