Surname O'Shaughnessy (O'Shaughnessy 
) , in the world, is quite a rare last name. The last name O'Shaughnessy is habitual in Ireland, where it is quite a common surname, Bermuda, and Australia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Ireland, the United States, and the United Kingdom.
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| O'Shaughnessy | United Kingdom, United States, Ireland, Australia, Canada |
O'Seachnasaigh, Oshaughnessey, Oshaughnessy, and Shaughnessy
| william o'shaughnessy Irish Major-General in the French service (b. 1674) |
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| james o'shaughnessy Roman Catholic bishop (b. 1745) |
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william brooke o'shaughnessy Irish physician and polymath, IE (b. 1809) |
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arthur o'shaughnessy British poet and herpetologist, GB (b. 1844) |
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| edward o'shaughnessy (1801-1840) journalist, poet and editor (b. 1801) |
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| richard o'shaughnessy (1813-1889) (b. 1813) |
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michael o'shaughnessy American engineer, US (b. 1864) |
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edith o'shaughnessy American writer, US (b. 1876) |
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| james edward o'shaughnessy James Edward O'Shaughnessy (1833-1908) 1908 Obituary [1] (b. 1833) |
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| richard o'shaughnessy Irish politician, died 1918, IE (b. 1842) |
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| thomas o'shaughnessy Irish judge (b. 1850) |
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| edward o'shaughnessy cricketer (1860-1885), GB (b. 1860) |
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| andrew o'shaughnessy Irish politician and industrialist (b. 1866) |
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| richard gorman o'shaughnessy Richard Gorman O'Shaughnessy (1867-1903) 1903 Obituary [1] RICHARD BORMAN O’SHAUGHNESSY, eldest surviving son of Mr. J. E. O’Shaughnessy, ... (b. 1867) |
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| thomas a. o'shaughnessy American artist (1870-1956) (b. 1870) |
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