Family name O'Riain (O'Riain 
) , around the world, is a rare cognomen. The family name O'Riain is characteristic of Ireland, where it is quite a rare surname, Australia, where it is a very rare surname, and France.
| VARIANT | COUNTRY |
|---|---|
| O'Riain | Australia, United Kingdom, France, Canada, Ireland |
| natasha selina o'riain (born 1963) (b. 1963) |
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| paul o'riain Irish skipper, IE (b. 1968) |
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| bearnard o'riain Peerage person ID=126467 |
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| m justin o'riain researcher |
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