Last name Twardowski (Twardowski 
, Твардовський 
, Твардовски 
) , around the world, is quite a common cognomen. The surname Twardowski is habitual in Poland, where it is quite a rare surname, Ukraine, and France, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Poland, the United States, and Ukraine. Also, Twardowski is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Twardowski | Poland, Brazil, France, Germany, United States |
| Твардовський | Ukraine |
| Твардовски | Russia |
| samuel twardowski Polish poet and writer, PL (b. 1600) |
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| konstantin von twardowski PL (b. 1760) |
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| józef twardowski Russian mathematician (b. 1786) |
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| piotr antoni twardowski (b. 1800) |
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| friedrich heinrich konstantin von twardowski (b. 1801) |
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kazimierz twardowski Polish philosopher, psychologist and logician, PL (b. 1866) |
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| kazimierz twardowski (b. 1813) |
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juliusz twardowski politician (1874-1945), AT (b. 1874) |
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fritz von twardowski German diplomat and screenwriter (1890-1970), DE (b. 1890) |
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| bolesław twardowski Polish historian (b. 1856) |
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czesław twardowski PL (b. 1898) |
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jan twardowski Polish writer, Catholic priest, PL (b. 1915) |
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jerzy twardowski Polish journalist, PL (b. 1918) |
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edmund twardowski Polish engineer, PL (b. 1922) |
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romuald twardowski Polish composer, PL (b. 1930) |
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