Cognomen Teahan (Teahan 
) , across the world, is a rare surname. The family name Teahan is characteristic of Ireland, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| Teahan | Australia, Canada, Ireland, United Kingdom, United States |
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michael john teahan politician in Massachusetts, US (b. 1840), US (b. 1840) |
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robert s. teahan politician in Massachusetts, US, US (b. 1921) |
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kathleen teahan American politician, US (b. 1947) |
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| john teahan Australian politician, AU (b. 1900) |
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| terence teahan Traditional Irish musician and composer (b. 1905) |
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| gerard teahan Roman Catholic archbishop |
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| matt teahan college basketball player (1978–1979) Denver |
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| chris teahan college basketball player (2018–2020) Kansas |
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| gerald teahan Peerage person ID=567249 |
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| áine teahan researcher (ORCID 0000-0002-4734-1457) |
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| chris teahan American basketball player, US |
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| mary teahan Peerage person ID=567247 |
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