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| Ardiff | fairly rare: E.Kildare etc. Origin not clear. |
| Cardiff | fairly rare: Wexford etc. Ir. de Carduibh. Cambro-Normans, 13 cent. Also occurs as Kerdiff. See Kerdiffstown in Kildare. |
| de Carduibh | Cardiff: líon beag: Loch Garman. Breatnaigh a shocraigh go luath i Laighin. |
Parishes where Carduff and a second surname are both baptised.