Cognomen Kirwin (Kirwin 
) , across the world, is quite a rare surname. The surname Kirwin is characteristic of the United Kingdom, where it is a rare surname, Australia, and Canada. In absolute terms, it most frequently occurs in the United States, the United Kingdom, and Australia. Very seldom, Kirwin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kirwin | Australia, Canada, United States, United Kingdom, South Africa |
| dominick kirwin Irish soldier (b. 1601) |
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frank kirwin Australian rules footballer, AU (b. 1921) |
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| edmund kirwin Australian rules footballer (b. 1876) |
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| thomas joseph kirwin (b. 1889) |
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| john j. kirwin United States Navy Navy Cross recipient, US (b. 1918) |
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| lindi kirwin GB (b. 1959) |
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| thomas kirwin researcher |
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| william kirwin Ph.D. University of Colorado at Boulder 2004 |
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| susan kirwin researcher ORCID ID = 0000-0003-2008-4654 |
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| erin kirwin researcher (ORCID 0000-0001-6957-7236) |
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| jack kirwin college basketball player (1955–1956) Gonzaga |
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| matthew kirwin |
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| kirwin christoffels South African cricketer, ZA (b. 1994) |
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