Family name O'Gara (O'Gara 
, Ó Gadhra) , globally, is quite a rare surname. The family name O'Gara is habitual in Northern Europe, particularly Ireland, where it is quite a rare surname, Isle of Man, and the United Kingdom, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the United States, Ireland, and the United Kingdom.
| VARIANT | COUNTRY |
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| O'Gara | Belgium, United Kingdom, Australia, Ireland, United States |
| john patrick o'gara (b. 1692) |
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| charles o'gara FR (b. 1699) |
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| patrick joseph o'gara botanist (1872-1927) (b. 1872) |
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| william henry o'gara (b. 1877) |
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| gerald j. o'gara American politician (1902-1989), US (b. 1902) |
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ronan o'gara Irish rugby union footballer and coach, US (b. 1977) |
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| william o'gara American politician in Maine (born 1931), US (b. 1931) |
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rob o'gara ice hockey defenseman, US (b. 1993) |
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| margaret o'gara birthdate: 1947 deathdate: 2012 viaf: 40905051 (b. 1947) |
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| james o'gara (b. 1965) |
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| brian o'gara researcher |
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| james p o'gara researcher |
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| fergal o'gara researcher |
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| oliver o'gara Irish politician and soldier |
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| bernard o'gara Roman Catholic Archbishop of Tuam |
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