Last name O'Hara (オハラ 
, O'Hara 
, אוהרה 
) , all around the world, is a common surname. The cognomen O'Hara is habitual in 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 commonest in the United States, the United Kingdom, and Ireland. Also, O'Hara is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| オハラ | Japan |
| O'Hara | Australia, Ireland, Canada, United States, United Kingdom |
| אוהרה | Israel |
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james o'hara, 2nd baron tyrawley Irish officer in the British Army, IE (b. 1682) |
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| charles o'hara, 1st baron tyrawley General and Commander-in-Chief, Ireland (b. 1640) |
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charles o'hara British Army general, PT (b. 1740) |
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james o'hara American general, US (b. 1752) |
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| charles o'hara Irish landowner and Member of Parliament (b. 1746) |
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william o'hara The first bishop of Scranton, Pennsylvania, GB (b. 1816) |
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| edward o'hara Canadian politician, CA (b. 1767) |
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theodore o'hara Confederate Army officer, US (b. 1820) |
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james e. o'hara American politician (1844-1905), US (b. 1844) |
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| james o'hara British MP (1796-1838) (b. 1796) |
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helen sophia o'hara Irish watercolour artist, GB (b. 1846) |
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| elizabeth o'hara (1799-1875) (b. 1799) |
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| james o'hara (b. 1800) |
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joseph w. o'hara lawyer, jurist (1863-1938), US (b. 1863) |
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john m. o'hara politician in Massachusetts, US, US (b. 1865) |
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