Surname Brosnahan (Brosnahan 
) , across the world, is a rare last name. The cognomen Brosnahan is habitual in New Zealand, where it is quite a rare surname, Ireland, and Switzerland, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in the United States, New Zealand, and Ireland.
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| Brosnahan | United Kingdom, Australia, Ireland, United States, New Zealand |
| timothy brosnahan (b. 1856) |
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| thomas brosnahan New Zealand cricketer, NZ (b. 1892) |
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| maureen brosnahan Canadian journalist (b. 1901) |
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| seán brosnahan Irish politician, IE (b. 1911) |
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| thomas joseph brosnahan IE (b. 1905) |
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rachel brosnahan American actress, US (b. 1990) |
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| james d. brosnahan American politician, US (b. 1962) |
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| cara brosnahan researcher |
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| james brosnahan college basketball player (1954–1955) Boston College |
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| michael l brosnahan researcher |
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| naomi brosnahan researcher ORCID ID = 0000-0002-3354-1060 |
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| mary minnie brosnahan (died 1925) |
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| sandra brosnahan geoscientist, ORCID ID = 0000-0003-3797-4207 |
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