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| Cadogan | Quite numerous: Cork etc. A Welsh name Cadwgan, but in Ireland usually an anglicisation of Ir. Ó Ceadagáin. Welsh Cadogans were of note in Dublin in 17 cent. |
| Cuddigan | rare: Cork. Ir. Ó Ceadagáin. Now often appearing as Cadogan, q.v. SI. |
| Ó Ceadagáin | rare: Clear Island etc. Ir.Lang. See Cadogan. |
| Ó Ceadagáin | Cadogan: líon beag i gCorcaigh (Gaeil) agus i Loch Garman (Breatnaigh). Ciallaíonn an t-ainm Breatnach Cadwgan, cathach, trodach. Ni fios go cinnte cén bhrí atá le Ceadagán.SI. |
Parishes where Kedigan and a second surname are both baptised.