Last name Dennett (Dennett 
) , globally, is quite a rare cognomen. The cognomen Dennett is habitual in Isle of Man, where it is quite a rare surname, the United Kingdom, and New Zealand. In absolute terms, the name is most common in the United Kingdom, the United States, and Australia. Much less frequently, Dennett is the forename as well as the last name.
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| Dennett | Australia, Canada, New Zealand, United Kingdom, United States |
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mary dennett prioress of the Holy Sepulchre, Liège (1730–1781), GB (b. 1730) |
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jeremy bentham dennett politician in Massachusetts, US (b. 1833), US (b. 1833) |
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charles e. dennett politician in Massachusetts, US, US (b. 1837) |
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| john dennett English inventor of a life-saving rocket, and antiquarian (1790–1852) (b. 1790) |
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| william hugh dennett (1796-1877) (b. 1796) |
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| lydia louisa neal dennett American suffragist, US (b. 1798) |
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| lydia neal dennett (b. 1798) |
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fred dennett American politician (1863-1928), US (b. 1863) |
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mary dennett American activist, US (b. 1872) |
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george dennett English cricketer (1879-1937), GB (b. 1879) |
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| edward dennett (b. 1831) |
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roger dennett politician in Massachusetts, US, US (b. 1895) |
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| dennett thomas kinder (1846-1941) (b. 1846) |
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| john richard dennett (b. 1838) |
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| fred a. dennett American politician and businessman, US (b. 1849) |
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