For background on how the map was made (and its flaws), see the relevant blog entry.
|Goonery||Very rare: Midlands. Ir. Ó Gamhnaire (calf-herd). A name of Meath which has been changed to Montgomery. SI & SGG.|
|Montgomery||Very numerous: Ulster generally, Dublin. A Norman name, current in Scotland and in Ireland 17 cent. There is a gaelicisation Mac Iomaire, Mac an Iomaire. SI.|
DEDs where Montgomery and a second surname are found together