Family name Diffey (Diffey 
) , all over the world, is a rare cognomen. The family name Diffey is habitual in the United Kingdom, where it is a rare surname, Australia, and New Zealand. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, the United States, and Australia. Very seldom, Diffey is the forename as well as the last name.
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| Diffey | United Kingdom, Australia, United States, Canada, Democratic Republic of the Congo |
| lot diffey Australian politician (1877-1952), AU (b. 1877) |
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leigh diffey Australian sports commentator, AU (b. 1971) |
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| t. j. diffey (b. 1938) |
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| emma diffey Peerage person ID=651401 |
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| simon diffey Ph.D. Australian National University 2012 |
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| douglas george diffey Peerage person ID=651402 |
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| brian l diffey researcher |
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| daniel s. diffey |
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