Cognomen Cassidi (Cassidi 
) , worldwide, is a very rare last name. The surname Cassidi is habitual in Indonesia, where it is a very rare surname, the United Kingdom, where it is an extremely rare surname, and France. Not in comparison with a country's population, it most frequently occurs in Indonesia, the United Kingdom, and Nigeria. More prevalently, Cassidi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Cassidi | United Kingdom, Brazil, Spain, Indonesia, United States |
| francis richard cassidi (1858-1939) (b. 1858) |
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| marjorie may cassidi (1888-1890) (b. 1888) |
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| francis laird cassidi (1889-1963) (b. 1889) |
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| robert alexander cassidi (1894-1966) (b. 1894) |
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| desmond cassidi British admiral (1925-2019) (b. 1925) |
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| francis paul cassidi (born 1925) (b. 1925) |
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| arthur desmond cassidi (born 1925) (b. 1925) |
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| marion jane f. cassidi (born 1931) (b. 1931) |
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| clare louisa cassidi (born 1952) (b. 1952) |
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| penelope jenetta cassidi (1954-2018) (b. 1954) |
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| rosalind eileen cassidi (born 1954) (b. 1954) |
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| alison ruth cassidi (born 1955) (b. 1955) |
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| rory francis alexander cassidi (born 1958) (b. 1958) |
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| francis james cassidi (born 1962) (b. 1962) |
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| mary mortimer cassidi (died 1917) |
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May, Durant, Gibson, Taylor, Thomas, Howell, Wilson, Mccarty, Stabile, Carroll, Collins, Beracochea, Roberts, Haskell, Hunkler, Anderson, Townsend, Williams, Westrate, Schneider, Beckstein, Patterson, Porter, Parker, Bemrose, Carter, Dunn, Long, Hill, Wood, Smith, Allen, Casey, Knuth, Perot, Pease, Henderson, Pyles, Green, Lewis, Lynch, Jones, Olson, Young, Martin, Murray, Mccann, Amster, Davis, and Linnenkugel