Surname Cassiday (Cassiday 
) , throughout the world, is a rare last name. The cognomen Cassiday is characteristic of the United States, where it is a rare surname, New Zealand, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Canada. Much less frequently, Cassiday is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cassiday | United Kingdom, South Africa, United States, Canada, New Zealand |
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george cassiday American bootlegger (b. 1892) |
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| bruce cassiday American writer, US (b. 1920) |
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| george cassiday American physicist, US (b. 1941) |
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| julie cassiday American literary scholar |
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| patrick a cassiday researcher |
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| stacy cassiday |
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| pamela k cassiday |
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