Cognomen Kłaczyński (Kłaczyński 
) , in the world, is a very rare surname. The family name Kłaczyński is characteristic of Eastern Europe, particularly Poland, where it is a rare surname.
| kazimierz kłaczyński PL (b. 1797) |
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włodzimierz kłaczyński PL (b. 1933) |
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| bolesław kłaczyński Officer of the Polish Army, UA (b. 1895) |
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| maciej kłaczyński researcher |
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| sebastian kłaczyński Polish sportsperson, PL (b. 1989) |
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