| Ó Ríordáin | rare: scattered. Ir.Lang. See O'Riordan. |
| Ó Ríordáin | Riordan: an-líonmhar: Corcaigh-Luimneach theas-Ciarraí & rl. Clann a bhain le Éile Uí Chearúill ach bhog iad go Corcaigh sa mheán-aois. Seandálaí iomráitheach dob ea Seán P. Ó Ríordáin (1905-57) agus caithfear Seán Ó Ríordáin ((1916-77), file, a lua; bhí tionchur mór aige ar fhilíocht an lae inniu. Fréamh: rí + bard, teideal a d'oir go maith don Sheán sa thuas. IF. |
| O'Reardon | rare: scattered. Ir. Ó Ríordáin. See O'Riordan. |
| O'Riordan | Very numerous: mainly Munster and particularly Cork. Ir. Ó Ríoghbhardáin, modern Ó Ríordáin. Derivation: "royal bard". A sept of Tipperary, related to the O'Carrolls, they moved to Cork after the Invasion. See also Riordan. IF. |
| Reardon | fairly numerous: Cork-Limerick-Kerry-Tipperary etc. Ir. Ó Ríoghbhardáin (Ríordáin). See Riordan. |
| Riordan | numerous: Cork-W Limerick-Kerry etc. Ir. Ó Ríordáin. See O'Riordan. |
DEDs where Riordan and a second surname are found together
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