Last name Deffenbaugh (Deffenbaugh 
) , worldwide, is quite a rare surname. The family name Deffenbaugh is habitual in the United States, where it is a rare surname, Hong Kong, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Deffenbaugh | United Kingdom, Canada, United States, Hong Kong |
| gary deffenbaugh American educator and politician, US (b. 1949) |
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| andrew e deffenbaugh researcher (ORCID 0000-0002-8364-6186) |
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| john deffenbaugh American politician, US |
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| amie m deffenbaugh researcher |
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| daniel g. deffenbaugh |
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| mark deffenbaugh American singer, guitarist and multiinstrumentalist, US |
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