Cognomen Dayhoff (Dayhoff 
) , in all the world, is a rare last name. The last name Dayhoff is habitual in the United States, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Dayhoff | New Zealand, Brazil, Canada, United States |
| harry dayhoff American football player (1896-1963), US (b. 1896) |
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ruth dayhoff American physician and medical bioinformatician (b. 1952) |
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| margaret oakley dayhoff American biochemist (1925-1983), US (b. 1925) |
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| nancy dayhoff associate professor emerita of nursing |
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| judith elaine dayhoff Ph.D. University of Pennsylvania 1980 |
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