Family name Cassedy (Cassedy 
) , across the world, is a rare last name. The cognomen Cassedy is habitual in Ireland, where it is a rare surname, the United States, and the United Kingdom, where it is a very rare surname. Much less frequently, Cassedy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cassedy | United Kingdom, Spain, Philippines, Ireland, United States |
| george cassedy American politician (1783-1842), US (b. 1783) |
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| hiram cassedy (b. 1820) |
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| sylvia cassedy American novelist and poet (1930-1989), US (b. 1930) |
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| edward s. cassedy US (b. 1927) |
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| amy e cassedy researcher |
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| steven cassedy |
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| sean cassedy (b. 1982) |
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