Family name Casswell (Casswell 
) , globally, is a rare surname. The cognomen Casswell is characteristic of the United Kingdom, where it is a rare surname, Australia, and Canada. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, the United States, and Australia. Much less frequently, Casswell is the forename as well as the last name.
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| Casswell | Canada, Australia, United States, United Kingdom, South Africa |
| j. d. casswell British lawyer (b. 1886) |
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| arthur casswell (1892-1940), GB (b. 1892) |
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sally casswell New Zealand psychology academic |
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| simon fitzroy casswell (1931-2012) (b. 1931) |
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| hugh fitzroy casswell (1958-1976) (b. 1958) |
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| edward fitzroy casswell (born 1958) (b. 1958) |
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| jane elizabeth casswell (born 1962) (b. 1962) |
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| mike casswell British musician; session guitarist, GB (b. 1963) |
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| karen mary casswell (born 1969) (b. 1969) |
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| nicholas casswell English composer specializing in chamber music, GB (b. 1974) |
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| marjory ethel casswell Peerage person ID=533475 |
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| emil george henry casswell Peerage person ID=533476 |
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| joshua david casswell Peerage person ID=598616 |
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| james fitzroy casswell (born 1987) (b. 1987) |
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| mark casswell (born 1989) (b. 1989) |
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