Family name Casley (Casley 
) , across the world, is a rare last name. The last name Casley is characteristic of Australia, where it is a rare surname, Ireland, and New Zealand. Measured by absolute frequency, it is the most numerous in Australia, the United Kingdom, and the United States. Much less frequently, Casley is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casley | Canada, United Kingdom, United States, Ireland, Australia |
| david casley Casley, David (1681/2–1754), librarian (b. 1681) |
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leonard casley founder of Principality of Hutt River, AU (b. 1925) |
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| jack casley Professional footballer (1926-2014), GB (b. 1926) |
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| shirley casley (b. 1928) |
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| d. j. casley (b. 1935) |
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| graeme casley last prince of micronation Principality of Hutt River, AU (b. 1957) |
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