Last name Fennessy (Fennessy 
) , across the world, is quite a rare cognomen. The surname Fennessy is habitual in Ireland, where it is quite a rare surname, New Zealand, and Australia. In absolute terms, it most frequently occurs in the United States, Ireland, and Australia.
| robert fennessy (1799-1847) (b. 1799) |
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| frances louisa fennessy (1829-1884) (b. 1829) |
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| leo fennessy Australian politician, AU (b. 1907) |
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| edward fennessy English electrical engineer (b. 1912) |
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| desmond fennessy Australian journalist (b. 1916) |
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| sue fennessy Australian-born American entrepreneur (b. 1968) |
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| paul fennessy researcher (ORCID 0000-0002-5908-2229) |
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| paul fennessy researcher (ORCID 0000-0002-8631-403X) |
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| gerard j. fennessy researcher |
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| julian fennessy researcher (ORCID 0000-0001-5871-8267) |
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| aidan fennessy Australian playwright, stage director and actor |
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| peter francis fennessy New Zealander awarded ONZM in 2022 for services to agricultural science and business, NZ |
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| niall fennessy researcher |
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| david fennessy (b. 1976) |
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| rena fennessy |
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