Surname Henehan (Henehan 
) , globally, is a rare last name. The last name Henehan is characteristic of Ireland, where it is quite a rare surname, the United States, where it is a rare surname, and New Zealand. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Henehan | United Kingdom, Australia, Ireland, United States, Canada |
| kira henehan American author and novelist, US (b. 1974) |
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| michael henehan geochemist and palaeoclimate researcher |
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| gary t m henehan researcher (ORCID 0000-0001-9208-6937) |
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| kathleen henehan doctoral candidate at the London School of Economics and Political Science |
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