| Dickson | Very numerous: Ulster generally, Dublin and small numbers in the south. The synonym Crickard indicates the Ir. Mac Riocaird. Dickson is also used for Ó Díochon, q.v. |
| Dixon | numerous: Leinster and Ulster. Ir. Mac Riocaird. English generally; also an anglicisation of Ó Díochon in Antrim. The synonym Dickson is more numerous still. |
Parishes where Dickson and a second surname are found together
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