Cognomen Shanahan (Shanahan 
) , all over the world, is a common surname. The last name Shanahan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in the United States, Ireland, and Australia.
| VARIANT | COUNTRY |
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| Shanahan | Ireland, Canada, United Kingdom, United States, Australia |
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jeremiah f. shanahan Catholic bishop, US (b. 1834) |
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| edward shanahan American politician, US (b. 1806) |
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david shanahan American politician, US (b. 1862) |
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patrick shanahan United States Navy Medal of Honor recipient (1867-1937), IE (b. 1867) |
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| margaret shanahan (20 Jan 1840 - certain 24 Feb 1909) (b. 1840) |
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| john w. shanahan Catholic bishop (1846-1916) (b. 1846) |
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jennie shanahan member of the Irish Citizen Army (b. 1897) |
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jim shanahan Australian rules footballer (1901-1985), AU (b. 1901) |
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| john shanahan (b. 1847) |
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| catherine shanahan (1864-1918) (b. 1864) |
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| thomas shanahan rugby union player, IE (b. 1864) |
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| martin shanahan (b. 1855) |
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| edmund thomas shanahan 1868–1929 theologian (b. 1868) |
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| philip shanahan Irish politician, IE (b. 1874) |
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| teresa burston shanahan (1879-1963) (b. 1879) |
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