Cognomen Deacy (Deacy 
) , all over the world, is a rare family name. The cognomen Deacy is characteristic of Ireland, where it is quite a rare surname, Albania, where it is a rare surname, and the United Kingdom. In absolute terms, the name is most common in the United States, the United Kingdom, and Ireland. Likewise, Deacy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Deacy | Brazil, United Kingdom, United States, Ireland, Indonesia |
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susan deacy classical scholar and professor specializing in gender and sexuality, ancient Greek mythology and religion, and disability studies |
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| ed deacy American actor, US (b. 1946) |
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| nick deacy Welsh footballer (born 1953), GB (b. 1953) |
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| eamonn deacy Irish footballer (1958-2012), IE (b. 1958) |
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| brendon deacy (b. 1964) |
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| william w deacy researcher |
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| christopher deacy (b. 1973) |
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