Family name O'Hearn (O'Hearn 
) , worldwide, is quite a rare cognomen. The cognomen O'Hearn is characteristic of Canada, where it is quite a rare surname, Australia, and New Zealand, where it is a rare surname. In absolute terms, it is the most numerous in the United States, Canada, and Australia.
| VARIANT | COUNTRY |
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| O'Hearn | Canada, United Kingdom, United States, New Zealand, Australia |
| francis o'hearn Irish Roman Catholic priest and author (b. 1747) |
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george e. o'hearn American football and baseball coach (1880-1967), US (b. 1880) |
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william a. o'hearn politician in Massachusetts, US (born 1887), US (b. 1887) |
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eileen o'hearn American actress (1913-1992), US (b. 1913) |
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| walter o'hearn New South Wales politician, AU (b. 1890) |
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| victoria o'hearn nurse in France during WWI, BE (b. 1891) |
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| john o'hearn American football player (1893-1977), US (b. 1893) |
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| ed o'hearn American football player (1898–1972), US (b. 1898) |
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patrick o'hearn American recording artist, multi-instrumentalist and composer, US (b. 1954) |
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| walter d. o'hearn Canadian journalist (b. 1910) |
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peter o'hearn computer scientist, CA (b. 1963) |
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christine o'hearn American lawyer, US (b. 1969) |
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mike o'hearn American bodybuilder, US (b. 1969) |
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| robert o'hearn American scenic designer for Broadway/Opera/Ballet, US (b. 1921) |
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| don o'hearn Canadian ice hockey player (1928-2015), CA (b. 1928) |
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