Last name O'Riordan (O'Riordan 
) , around the globe, is quite a rare cognomen. The last name O'Riordan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom, where it is a rare surname.
| VARIANT | COUNTRY |
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| O'Riordan | United Kingdom, Australia, Ireland, United States, Canada |
| v. migliardi o'riordan author (1801-2000) (b. 1801) |
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john o'riordan Irish catholic priest, IE (b. 1851) |
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michael o'riordan (b. 1857) |
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| conal holmes o'connell o'riordan Irish writer, IE (b. 1874) |
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dolores o'riordan Irish musician, IE (b. 1971) |
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| john c. o'riordan Roman Catholic Bishop, IE (b. 1924) |
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| gerry o'riordan Irish hurler, IE (b. 1925) |
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| mossy o'riordan Irish hurler, IE (b. 1926) |
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marie o'riordan Irish journalist |
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| thomas o'riordan Irish long-distance runner, IE (b. 1937) |
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| jerry o'riordan Irish Gaelic footballer (b. 1939) |
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annmarie o'riordan Irish singer-songwriter, IE (b. 1990) |
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| alec o'riordan cricketer, IE (b. 1940) |
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| denis o'riordan Irish hurler, IE (b. 1940) |
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cait o'riordan GB |
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