Last name Delahunty (Delahunty 
) , in the world, is quite a rare cognomen. The last name Delahunty is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in Ireland, Australia, and the United States.
| VARIANT | COUNTRY |
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| Delahunty | United Kingdom, Australia, Ireland, United States, Canada |
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james delahunty politician (1808-1885) (b. 1808) |
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thomas lawrence delahunty American union president, US (b. 1867) |
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| joe delahunty Irish hurler, IE (b. 1888) |
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sarah delahunty New Zealand writer and director, b. 1952, NZ (b. 1952) |
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catherine delahunty New Zealand politician, NZ (b. 1953) |
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| tom delahunty British-New Zealand association football referee (1935-2018), GB (b. 1935) |
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| hugh delahunty Australian politician, AU (b. 1949) |
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| mary delahunty Australian politician and journalist, AU (b. 1951) |
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| george delahunty American physiologist and endocrinologist, US (b. 1952) |
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| mike delahunty Australian rules footballer (b. 1952) |
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liam delahunty |
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| johanne delahunty British QC, GB (b. 1963) |
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| jo delahunty UK lawyer QC and Prof, GB (b. 1963) |
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| sinéad delahunty Irish middle-distance runner, IE (b. 1971) |
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| damian delahunty (born 1976), GB (b. 1976) |
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