Last name Lenahan (Lenahan 
) , all over the world, is quite a rare cognomen. The last name Lenahan is characteristic of Guam, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United States, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Canada.
| VARIANT | COUNTRY |
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| Lenahan | United Kingdom, Ireland, Guam, United States, Canada |
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john thomas lenahan American politician (1852-1920), US (b. 1852) |
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john lenahan American entertainer, US (b. 1961) |
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| tim lenahan American soccer coach, US (b. 1959) |
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| matthew "sash" lenahan American reality television participant, US (b. 1979) |
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| john lenahan college basketball player (1974–1974) Wisconsin |
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| terrence albert lenahan Ph.D. University of Pennsylvania 1970 |
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| cameron lenahan researcher (ORCID 0000-0002-2979-7979) |
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