Surname Clewett (Clewett 
) , globally, is a rare cognomen. The surname Clewett is habitual in Australia, where it is a rare surname, New Zealand, and the United Kingdom. In absolute terms, this name is the most popular in the United States, the United Kingdom, and Australia. Much less frequently, Clewett is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Clewett | Sweden, United Kingdom, Australia, United States, Canada |
| isabella jane clewett (b. 1842) |
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| bruce clewett (b. 1953) |
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| david clewett researcher (ORCID 0000-0003-0026-8034) |
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| debra ann clewett Peerage person ID=129860 |
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| malcolm clewett Peerage person ID=131302 |
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