Surname O'Malley (O'Malley 
, אומאלי 
, اومالي) , in the world, is a common family name. The family name O'Malley is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. In absolute terms, this name is the most popular in the United States, Ireland, and Australia.
| VARIANT | COUNTRY |
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| O'Malley | Ireland, Australia, United States, United Kingdom, Canada |
| אומאלי | Israel |
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george o'malley officer (1780-1843) (b. 1780) |
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edward loughlin o'malley British lawyer, judge; Chief Judge of HBM Consular Court of the Ottoman Empire (b. 1842) |
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| thaddeus o'malley Irish Roman Catholic priest and political writer (b. 1796) |
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| george o'malley father of John O'Malley Sr., IE (b. 1798) |
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| charles o'malley American fur trader and politician, US (b. 1800) |
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robert george o'malley Canadian politician, CA (b. 1856) |
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austin o'malley American author, US (b. 1858) |
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edward r. o'malley American lawyer and New York Supreme Court justice, US (b. 1863) |
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| peter frederick o'malley (b. 1804) |
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| henry o'malley (1818-1867) (b. 1818) |
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| john o'malley sr. husband of Margaret Collins, IE (b. 1825) |
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matthew vincent o'malley American politician (1878-1931), US (b. 1878) |
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edwin joseph o'malley American politician (1881-1953), US (b. 1881) |
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mabel o'malley wife of Emile James Ozanne (1883-1926), US (b. 1883) |
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| michael o'malley Irish-Australian civil servant, IE (b. 1835) |
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