Last name Dieffenbach (Dieffenbach 
) , in the entire world, is quite a rare surname. The surname Dieffenbach is habitual in Western Europe, particularly Germany, where it is a rare surname, Belgium, and Switzerland. Not in comparison with a country's population, the name is most common in the United States, Germany, and France.
| VARIANT | COUNTRY |
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| Dieffenbach | Netherlands, Belgium, United States, Germany, France |
| wilhelm dieffenbach DE (b. 1596) |
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| heinrich dieffenbach DE (b. 1626) |
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| johann lorenz dieffenbach (b. 1682) |
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| adam gerhard balthasar dieffenbach DE (b. 1720) |
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johann philipp dieffenbach German teacher and historian from Hessen (1786-1860), DE (b. 1786) |
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johann friedrich dieffenbach German surgeon (1792-1847), DE (b. 1792) |
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ernst dieffenbach German physician, geologist and naturalist (1811-1855), DE (b. 1811) |
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| karl dieffenbach (b. 1763) |
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anton dieffenbach German painter (1831-1914), DE (b. 1831) |
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| georg dieffenbach German politician (1787-1848), DE (b. 1787) |
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| joseph dieffenbach Austrian gardener (1796-1863) (b. 1796) |
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| christian dieffenbach DE (b. 1791) |
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| wilhelm dieffenbach (b. 1796) |
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karl dieffenbach German officer (1859-1936), DE (b. 1859) |
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| georg christian dieffenbach German poet, DE (b. 1822) |
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