Family name Shannahan (Shannahan 
) , all over the world, is a rare cognomen. The surname Shannahan is habitual in Australia, where it is a rare surname, Canada, and New Zealand. Not in comparison with a country's population, this name is the most popular in the United States, Canada, and Australia.
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| Shannahan | Canada, New Zealand, Australia, United Kingdom, United States |
| william shannahan Catholic priest of the Diocese of Davenport who was the third president of St. Ambrose University., US (b. 1870) |
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| john h.k. shannahan American amateur historian of Maryland (b. 1880) |
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| oonah shannahan New Zealand netball player, NZ (b. 1921) |
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| sarah e shannahan researcher (ORCID 0000-0003-0151-2836) |
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| jonathan shannahan researcher ORCID ID = 0000-0002-1065-7810 |
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| christopher james shannahan theologian; associate professor |
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| dervla sara shannahan GB |
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| pat shannahan |
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