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| Carroll | Very numerous: all provinces and especially Laois-Kilkenny. Ir. Ó Cearbhaill, Mac Cearbhaill. The personal name Cearbhall is thought to mean "brave in battle". These names relate to a number of septs: e.g. O'Carroll of Ely (Laois) and O'Carroll of Oriel (S Ulster) and MacCarroll of S Leinster. See also (Mac)Carvill. SI,IF & GPN. |
| MacCarroll | numerous: Antrim & Ulster generally. Ir. Mac Cearbhaill (brave in battle) A sept of Ulster noted for musicians. Another sept existed in Carlow-Kilkenny. See also Mac Carville. IF & SGG. |
| MacKarel | rare: Louth-Monaghan. Ir. Mac Fhearghail (SGA). From first name Fearghal, brave. Difficult to distinguish from Mac Carroll, q.v. |
| MacKerell | rare: Belfast area. Ir. Mac Fhearghail (SGA). From first name Fearghal, brave. Some confusion with Mac Cearbhaill (Mac Carroll). |
| Ó Cearbhaill | fairly rare: scattered: Ir.Lang. See Carroll. |
| Ó Cearbhaill | Carroll: an-líonmhar ar fud na tíre, in Osraí ach go h-áirithe: bhí clanna in Éile (Uíbh Fhailí) agus Oirghialla. Bhí Ó Cearbhaill Éile pairteach i gCath Chluain Tarbh. Ainm pearsanta Cearbhall a chiallaíonn, b'fhéidir, "cróga sa chath".IF. |
| O'Carroll | numerous: all areas, especially Munster. Ir. Ó Cearbhaill. See Carroll |
Parishes where Carel and a second surname are both baptised.