Cognomen Hennesy (Hennesy 
) , all around the world, is a rare surname. The surname Hennesy is habitual in Ireland, where it is a rare surname, the United States, and Australia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Hennesy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Hennesy | Australia, Philippines, Guadeloupe, United States, United Kingdom |
| hugh hennesy American layout artist (1891-1954), US (b. 1891) |
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carolyn hennesy American actress, US (b. 1962) |
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| tom hennesy actor, Stuntman (1923-2011), US (b. 1923) |
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| dale hennesy production designer (1926-1981), US (b. 1926) |
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sean hennesy American musician, US |
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| joanna hennesy Peerage person ID=308202 |
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| minnie hennesy American suffragist, US |
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| frank hennesy |
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