Family name De Lacy (De Lacy 
) , around the world, is a rare cognomen. The surname De Lacy is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a rare surname, and Spain. Measured by absolute frequency, this name is the most popular in Australia, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| De Lacy | Ireland, United Kingdom, South Africa, Australia, Spain |
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hugh de lacy, lord of meath (1135-1186), GB (b. 1135) |
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roger de lacy English Baron (b. 1170) |
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| walter de lacy, lord of meath Irish noble, GB (b. 1172) |
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| hugh de lacy, 1รบ iarla uladh (1176-1242), IE (b. 1176) |
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| john de lacy 2nd Earl of Lincoln, 7th Baron of Halton Castle, 5th Lord of Bowland and Constable of Chester (b. 1192) |
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henry de lacy English noble, FR (b. 1249) |
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| egidia de lacy, lady of connacht Medieval Irish noblewomen, IE (b. 1205) |
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| maud de lacy Countess of Hertford and Gloucester, GB (b. 1223) |
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| maud de lacy, baroness geneville Irish-Norman noble, IE (b. 1230) |
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| edmund de lacy English noble (b. 1230) |
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| alice de lacy, 3rd countess of lincoln 4th Countess of Lincoln; born in Wales, GB (b. 1281) |
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| francisco antonio de lacy y white Mexican diplomat, ES (b. 1731) |
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| thomas de lacy (b. 1773) |
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| mary baptist de lacy Australian Sister of Charity, founded St Vincent's Hospital, Sydney, AU (b. 1799) |
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| charles de lacy British artist, GB (b. 1856) |
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Ali, Fred, Owen, Maria, Marie, Maris, Sarah, Shawn, Susan, Chris, Colin, Cilla, Barry, Brian, Bruna, Bruce, Peter, David, Garth, Gemma, Laura, Lynly, Emma, Ella, Nina, Tina, Amy, Zoe, Mary, Mark, Maud, Sian, Alan, Aine, Carl, Brad, Janet, Karl, Paul, Gary, Gill, Lacy, Lisa, Lynn, Jane, Jack, John, Toby, Katy, and James