Family name Willacy (Willacy 
) , throughout the world, is a rare last name. The cognomen Willacy is habitual in Jamaica, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in the United Kingdom, the United States, and Australia. Much less frequently, Willacy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Willacy | United Kingdom, Australia, Brazil, United States, Jamaica |
| john g. willacy Texas politician of late 19th and early 20th century, US (b. 1859) |
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| mark willacy Australian journalist, AU (b. 1901) |
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| david willacy (1916-1941), GB (b. 1916) |
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sarah willacy association football player, AU (b. 1995) |
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| willacy guy goulding Peerage person ID=95920 |
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| brittany willacy actress |
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| oliver willacy researcher (ORCID 0000-0002-1541-7795) |
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