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| Berrill | Quite numerous: Louth. Ir. Boiréil. Anglo-Normans, 13 cent. Also as Birrell. SI. |
| Birrell | Very rare: Belfast area. See Berrill. |
| Boiréil | Berrill, Birrell: líon beag: Co. Lú. A-Normannaigh ón 13 céad. |
Parishes where Birrell and a second surname are both baptised.