For background on how the map was made (and its flaws), see the relevant blog entry.
|Grealis||fairly rare: Mayo. Ir. Mag Riallais. See Grealish.|
|Grealish||Quite numerous: Galway. Ir. Mag Riallais, which is a corruption of the Ulster name Mac Niallais. SI & SGG.|
|Mag Riallghuis||Grealish: líon beag: Gaillimh. Claochlú ar an sloinne Ultach Mac Niallghuis. Préamh: Niall + gus (fuinneamh).|
DEDs where Grealish and a second surname are found together