Family name O'Farrell (O'Farrell 
, אופארל 
) , around the globe, is quite a rare cognomen. The last name O'Farrell is characteristic of Ireland, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and Australia. Not in comparison with a country's population, it most frequently occurs in Ireland, Australia, and the United States.
| richard o'farrell British general (b. 1601) |
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| francis fergus o'farrell Irish soldier and British major general, IE (b. 1700) |
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jasper o'farrell American politician, US (b. 1817) |
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michael j. o'farrell Catholic bishop (1832-1894), IE (b. 1832) |
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john a. o'farrell GB (b. 1823) |
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henry james o'farrell first person to attempt a political assassination in Australia, IE (b. 1833) |
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santiago gregorio o'farrell Argentinian politician (1861-1926), AR (b. 1861) |
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| john o'farrell Canadian lawyer and political figure, CA (b. 1826) |
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elizabeth o'farrell IE (b. 1884) |
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bob o'farrell American baseball player, manager, US (b. 1896) |
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george henry o'farrell politician in Massachusetts, US, US (b. 1910) |
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bernadette o'farrell Irish actress, IE (b. 1924) |
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ursula o'farrell IE (b. 1934) |
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| william o'farrell American writer, US (b. 1904) |
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barry o'farrell 43rd Premier of New South Wales and Minister for Western Sydney 2011–2014, AU (b. 1959) |
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