Family name Szlendak (Szlendak 
) , in all the world, is quite a rare last name. The cognomen Szlendak is habitual in Poland, where it is quite a rare surname, Canada, where it is a very rare surname, and France. Not in comparison with a country's population, it is commonest in Poland, the United States, and France. More frequently, Szlendak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Szlendak | Argentina, United States, Germany, Poland, France |
| stanisław szlendak Polish sportsperson, PL (b. 1920) |
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| waldemar szlendak Polish athletics competitor, PL (b. 1952) |
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| tomasz szlendak Polish sociologist, PL (b. 1974) |
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| joanna szlendak researcher |
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| urszula szlendak researcher, PL |
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| katarzyna szlendak PL (b. 1986) |
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