Surname Riain (Riain 
) , worldwide, is a rare last name. The surname Riain is characteristic of Ireland, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and France. Measured by absolute frequency, it most frequently occurs in Ireland, the United Kingdom, and the United States. Much less frequently, Riain is the forename as well as the last name.
| liam pádraig ó riain Irish journalist, IE (b. 1867) |
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| eoghan ó riain (b. 1864) |
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pól ó riain Irish hurler, IE (b. 1988) |
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| crisotóir ó riain Irish Gaelic football player, IE (b. 1957) |
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| anraí ó riain Irish hurler, IE (b. 1957) |
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| p.s. ó riain Irish hurler, IE (b. 1977) |
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| isobel ní riain IE (b. 1969) |
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| niamh ní riain archaeologist |
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| séamus ó riain Irish hurler, IE (b. 1987) |
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| cóilín ó riain Irish hurler, born 1988, IE (b. 1988) |
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| íde m. ní riain |
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| diarmuid ó riain AT |
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| pádraig ó riain IE (b. 1995) |
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