Family name Clacy (Clacy 
) , around the world, is a rare cognomen. The surname Clacy is habitual in Australia, where it is a rare surname, the United Kingdom, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in the United Kingdom, Australia, and the United States. Likewise, Clacy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Clacy | United Kingdom, Australia, Brazil, India, United States |
| john clacy Victorian architect (b. 1810) |
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| ellen clacy English writer, journalist (b. 1830) |
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| ellen louise clacy English artist (b. 1853) |
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| marie de clacy Peerage person ID=709092 |
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| amanda clacy researcher (ORCID 0000-0003-3381-9154) |
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