Surname Hennessey (Hennessey 
, הנסי 
, ヘネシー) , in the world, is a common cognomen. The last name Hennessey is habitual in Ireland, where it is quite a rare surname, Canada, and New Zealand. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Canada. Very seldom, Hennessey is the forename as well as the last name.
| john hennessey Anglo-Indian surveyor, GB (b. 1829) |
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| john david hennessey Australian writer, AU (b. 1847) |
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john hennessey American tennis player, US (b. 1900) |
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john j. hennessey United States Army four-star general (1921-2001), US (b. 1921) |
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| james hennessey (b. 1862) |
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| michael john hennessey (b. 1870) |
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| les hennessey Major League Baseball second baseman, US (b. 1893) |
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| frank charles hennessey Canadian artist (ca. 1894—1941), CA (b. 1894) |
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| wynnum groom hennessey Australian army officer killed in World War I, AU (b. 1895) |
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tim hennessey American politician, US (b. 1947) |
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michael hennessey American sheriff, US (b. 1948) |
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martha hennessey American politician, US (b. 1953) |
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| george hennessey American baseball player (1907-1988), US (b. 1907) |
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| dorothy hennessey American activist, US (b. 1913) |
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| edward f. hennessey Recipient of the Purple Heart medal, US (b. 1919) |
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