Last name O'Ryan (O'Ryan 
) , globally, is a rare surname. The last name O'Ryan is habitual in Chile, where it is quite a rare surname, Australia, where it is a rare surname, and Ireland. In absolute terms, it is commonest in Chile, Australia, and the United States. Much less frequently, O'Ryan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| O'Ryan | Colombia, Australia, United States, Chile, United Kingdom |
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tomás o'ryan Spanish general, ES (b. 1821) |
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john f. o'ryan United States Army general (1874-1961), US (b. 1874) |
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| william o'ryan New Zealand land surveyor (1851-1939), IE (b. 1851) |
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william o'ryan American Esperantist, US (b. 1944) |
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sandra o'ryan Chilean actress, CL (b. 1960) |
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| fergus o'ryan (b. 1911) |
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anna wynne o'ryan American playwright, US |
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tk o'ryan American professional wrestler, US (b. 1989) |
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| jorge o'ryan Chilean basketball player, CL (b. 1958) |
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| manuel o'ryan (b. 1958) |
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| anthony o'ryan Peerage person ID=252409 |
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| helena melefont o'ryan Peerage person ID=252410 |
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| miguel o'ryan researcher |
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| colleen o'ryan researcher |
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| manuel lermanda o'ryan Ph.D. The Ohio State University 1991 |
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