Surname Granahan (Granahan 
) , globally, is a rare cognomen. The surname Granahan is habitual in Ireland, where it is quite a rare surname, the United States, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Granahan | United Kingdom, Australia, Canada, United States, Ireland |
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kathryn e. granahan American politician (1894-1979), US (b. 1894) |
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william t. granahan American politician (1895-1956), US (b. 1895) |
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| david granahan (b. 1909) |
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| gerry granahan American singer and record producer, US (b. 1932) |
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| louise margaret granahan (b. 1964) |
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| kevin granahan |
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