Last name Holahan (Holahan 
) , around the world, is a rare cognomen. The last name Holahan is habitual in Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and Finland. In absolute terms, it is the most numerous in the United States, Australia, and Ireland.
| VARIANT | COUNTRY |
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| Holahan | United Kingdom, Ireland, Canada, Australia, United States |
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maurice f. holahan American politician, US (b. 1848) |
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winifred cartwright holahan silent film actress, US (b. 1900) |
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dennis holahan American actor, US (b. 1942) |
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| paul holahan American film, television director, cinematographer, producer and photographer, US (b. 1901) |
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| elizabeth gibson holahan (b. 1903) |
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francis m. holahan US |
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| charles j holahan researcher |
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| marie a holahan researcher |
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| matthew r holahan researcher (ORCID 0000-0001-7653-9262) |
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| cathy holahan American lawyer |
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| william l. holahan economist |
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| heather m holahan researcher (ORCID 0000-0002-1543-4341) |
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| carole k. holahan |
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