Last name Diefenbach (Diefenbach 
) , all around the world, is quite a rare family name. The cognomen Diefenbach is habitual in Germany, where it is quite a rare surname, Australia, where it is a rare surname, and the United States. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Diefenbach | Australia, Germany, France, Brazil, United States |
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georg anton lorenz diefenbach German writer and academic (1806-1883), DE (b. 1806) |
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| ludwig adam diefenbach DE (b. 1772) |
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karl wilhelm diefenbach German symbolist artist, founder of naturism (1851-1913), DE (b. 1851) |
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| leonhard diefenbach German educationist and painter (1814-1875), DE (b. 1814) |
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| johann diefenbach German historian, DE (b. 1832) |
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| julius diefenbach German politician and engineer (1835-1917), DE (b. 1835) |
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| karl diefenbach (b. 1835) |
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| friedrich diefenbach law professor, DE (b. 1861) |
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| wilhelm diefenbach DE (b. 1869) |
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| lucidus diefenbach German painter, DE (b. 1886) |
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| hans diefenbach (b. 1884) |
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| fritz diefenbach DE (b. 1890) |
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frank diefenbach German politician, DE (b. 1969) |
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| werner w. diefenbach (b. 1911) |
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| felix diefenbach German basketball player, DE (b. 1925) |
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