Cognomen Hammitt (Hammitt 
) , all around the world, is quite a rare surname. The family name Hammitt is characteristic of Jamaica, where it is a rare surname, the United States, and Norway, where it is a very rare surname. In absolute terms, it is the most numerous in the United States, Jamaica, and Canada.
| VARIANT | COUNTRY |
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| Hammitt | Australia, Canada, Jamaica, United States, United Kingdom |
| howard hammitt American photographer, US (b. 1876) |
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matt hammitt American musician, US (b. 1979) |
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| william e. hammitt (b. 1943) |
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| james k. hammitt economist (Harvard University; Toulouse School of Economics (TSE)) (b. 1956) |
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| james k. hammitt (b. 1956) |
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| laura l hammitt researcher |
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| katherine m hammitt researcher |
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| _ hammitt college basketball player (1971–1971) Brown |
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