Last name Lanahan (Lanahan 
) , around the world, is quite a rare family name. The surname Lanahan is habitual in the United States, where it is a rare surname, the United Kingdom, where it is a very rare surname, and Canada. Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Philippines.
| VARIANT | COUNTRY |
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| Lanahan | United Kingdom, Brazil, Canada, United States, Philippines |
| john lanahan (b. 1815) |
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| francis henry lanahan (b. 1897) |
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| dick lanahan American baseball player, US (b. 1911) |
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| leo lanahan candidate in the 2021 Scottish Parliament election (b. 1961) |
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| lauren lanahan researcher |
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| stephen m lanahan researcher (ORCID 0000-0002-7300-5684) |
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| michael lanahan screenwriter |
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