Cognomen Treacy (Treacy 
, تريسي 
, Трейси 
) , across the world, is quite a common last name. The last name Treacy is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and Puerto Rico. Measured by absolute frequency, it most frequently occurs in Ireland, the United States, and the United Kingdom. Very seldom, Treacy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Treacy | Democratic Republic of the Congo, Ireland, United Kingdom, United States, Australia |
| تريسي | Palestinian Territory, Syria |
| Трейси | Russia |
Treise, Ó Treasaigh, Треацы, and สมบัติ
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patrick ambrose treacy Australian Roman Catholic educationist (b. 1834) |
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eric treacy English photographer and bishop, GB (b. 1907) |
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| john patrick treacy Catholic bishop, US (b. 1890) |
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| emerson treacy actor (1900-1967), US (b. 1900) |
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| tommy treacy Irish hurler, IE (b. 1904) |
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| miguel ángel "lito" pérez treacy Costa Rican association football player (1905-1958), CR (b. 1905) |
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john treacy Irish distance runner, IE (b. 1957) |
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| grace murphy treacy (b. 1900) |
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philip treacy Irish designer and milliner, IE (b. 1967) |
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orla treacy missionary in South Sudan, IE (b. 1973) |
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| seán daniel treacy Irish politician (1923-2018), IE (b. 1923) |
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| william treacy (b. 1919) |
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| sean treacy (b. 1924) |
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| martin treacy Irish hurler, IE (b. 1936) |
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| jim treacy Irish hurler, IE (b. 1943) |
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