Cognomen Klopfer (Klopfer 
, Клопфер 
, Klofer 
) , in the entire world, is quite a rare last name. The family name Klopfer is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Switzerland, and Austria. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Switzerland. Much less frequently, Klopfer is the forename as well as the last name.
| balthasar christoph klopfer (b. 1659) |
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| friedrich gotthilf klopfer German classical philologist and teacher (1787-1845), DE (b. 1787) |
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karol klopfer (b. 1859) |
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gerhard klopfer official of the Nazi Party and assistant to Martin Bormann in the Office of the Party Chancellery (1905-1987), DE (b. 1905) |
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| fryderyk klopfer (b. 1865) |
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| carl ed. klopfer AT (b. 1865) |
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| paul klopfer architect, college teacher, DE (b. 1876) |
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| eugen klopfer LV (b. 1872) |
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| volkmar klopfer (b. 1874) |
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| margarethe klopfer holocaust victim, b. 1897-01-02, AT (b. 1897) |
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| bruno klopfer German psychologist, US (b. 1900) |
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| wilhelm hermann klopfer Swiss rower, CH (b. 1901) |
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| donald s. klopfer publisher, author, US (b. 1902) |
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matthias klopfer German politician, DE (b. 1968) |
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| heini klopfer Builder of ski jump hills (1918-1968), DE (b. 1918) |
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