Cognomen Houlahan (Houlahan 
) , in the world, is quite a rare family name. The surname Houlahan is habitual in Australia, where it is quite a rare surname, New Zealand, and Canada, where it is a rare surname. In absolute terms, it most frequently occurs in Australia, the United States, and Canada.
| VARIANT | COUNTRY |
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| Houlahan | Canada, New Zealand, Australia, United Kingdom, United States |
| bridget houlahan (born 1837) (b. 1837) |
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| eliza houlahan (b. 1867) |
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| kathleen houlahan (b. 1884) |
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chrissy houlahan American politician, US (b. 1967) |
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| harry houlahan English footballer (born 1930), GB (b. 1930) |
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| sheila houlahan American actress |
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| cathleen houlahan Peerage person ID=356938 |
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| patrick houlahan Northern Irish election candidate |
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| caitlin houlahan actress |
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| william houlahan Peerage person ID=356937 |
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| kathleen e houlahan researcher (ORCID 0000-0002-2273-2099) |
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| ger houlahan Gaelic football player, GB |
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| joanne frances houlahan Ph.D. The Johns Hopkins University 1996 |
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| bridget houlahan researcher (ORCID 0000-0001-8561-5482) |
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