Cognomen Willetts (Willetts 
) , globally, is quite a common last name. The family name Willetts is characteristic of Jersey, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United Kingdom, the United States, and Australia.
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| Willetts | Australia, Canada, United States, New Zealand, United Kingdom |
| mary willetts (b. 1681) |
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| william willetts Peerage person ID=626543 (b. 1697) |
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| mary willetts (died 1803) (b. 1766) |
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| anna willetts Peerage person ID=155469 (b. 1770) |
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| jacob willetts (b. 1785) |
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isaac e. willetts politician in Massachusetts, US, US (b. 1879) |
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| charles willetts (1859-1951) (b. 1859) |
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| alexander william willetts Yacht designer, builder and racer; cabinet-maker, NZ (b. 1900) |
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| albert leslie willetts yacht designer (b. 1900) |
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david willetts British politician (born 1956), GB (b. 1956) |
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karl willetts English vocalist, GB (b. 1966) |
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| william willetts British scholar of Southeast Asian art, GB (b. 1918) |
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| h. t. willetts English scholar of Russian (b. 1922) |
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| ronald frederick willetts (b. 1915) |
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| alice putnam willetts American field hockey player (b. 1926) |
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