Surname Delacy (Delacy 
) , across the world, is a rare last name. The surname Delacy is characteristic of Australia, where it is a rare surname, Ireland, and the United States. Measured by absolute frequency, it is commonest in the United States, Australia, and the United Kingdom. Much less frequently, Delacy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Delacy | United Kingdom, Australia, Ireland, United States, Brazil |
| patrick delacy Medal of Honor recipient, US (b. 1835) |
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| william delacy US (b. 1828) |
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monah delacy Brazilian actress, BR (b. 1930) |
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| ralph m. delacy American art director, US (b. 1886) |
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| hector delacy Australian sports journalist (1900-1956), AU (b. 1900) |
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| phillip delacy American classical philologist and philosopher, US (b. 1913) |
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| joel delacy (b. 1956) |
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| margaret delacy British author, GB |
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| allan clark delacy ichthyologist |
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| meg delacy American actress (b. 1996) |
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