Surname Duffek (Duffek 
) , around the world, is quite a rare cognomen. The last name Duffek is characteristic of Slovakia, where it is quite a rare surname, Czechia, and Austria. Measured by absolute frequency, it is commonest in Slovakia, the United States, and Czechia. Much less frequently, Duffek is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duffek | Germany, Czechia, Austria, United States, Slovakia |
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nikolaus duffek German writer and playwright, CZ (b. 1833) |
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| max duffek CZ (b. 1856) |
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| otakar duffek Czech physician (1875-1943), CZ (b. 1866) |
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| max duffek (b. 1877) |
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kornel duffek Slovak pedagogue, SK (b. 1938) |
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| helga duffek-kopper Austrian pedagogue and writer, AT (b. 1935) |
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| miloš duffek (b. 1928) |
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| helga duffek (b. 1935) |
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| karel duffek CZ (b. 1942) |
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| jiří duffek CZ (b. 1948) |
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| patty duffek American Playboy model, US (b. 1963) |
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| maria duffek (b. 1961) |
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| miroslav duffek Swiss canoeist, CH |
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| tatjana duffek (b. 1970) |
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| milo duffek Slalom canoeist, CH |
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