Last name Diefenbacher (Diefenbacher 
) , all over the world, is a rare family name. The surname Diefenbacher is habitual in Switzerland, where it is a rare surname, Germany, and Canada. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Switzerland.
| VARIANT | COUNTRY |
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| Diefenbacher | Canada, Switzerland, France, United States, Germany |
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michel diefenbacher French politician, FR (b. 1947) |
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| alfred diefenbacher French official, FR (b. 1915) |
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| karl diefenbacher DE (b. 1909) |
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| hans diefenbacher German economist, DE (b. 1954) |
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| jean-louis diefenbacher (b. 1945) |
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| michael diefenbacher German regional historian and archivist, DE (b. 1956) |
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| albert diefenbacher (b. 1954) |
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| ralf diefenbacher (b. 1957) |
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| tristan diefenbacher French official |
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| nina diefenbacher German association football player, DE |
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| hans diefenbacher Dr. rer. nat. Universität Kassel 1983 |
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| markus e diefenbacher researcher |
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| svenja diefenbacher researcher (ORCID 0000-0001-7560-2565) |
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| frank diefenbacher German racing driver, DE (b. 1982) |
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| julia diefenbacher German association football player, DE (b. 1987) |
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