For background on how the map was made (and its flaws), see the relevant blog entry.
|Darby||fairly numerous: Midlands, Dublin, Belfast area. English, 16 cent. but see also Darmody and Deyermond. The name has been associated with the Midlands. SI.|
|Derby||Quite numerous: E Ulster and scattered. English toponymic.|
DEDs where Darbey and a second surname are found together