For background on how the map was made (and its flaws), see the relevant blog entry.
|Grogan||numerous: all areas except Cork. Ir. Ó Gruagáin, perhaps from gruagach, a champion. They were erenaghs in Elphin (Roscommon), now greatly dispersed. The form Groogan occurs in Ulster. MIF & SGG.|
|Grugan||rare: Tyrone. See Grogan.|
|Ó Gruagáin||Grogan: líonmhar tríd an dtír. Bhí an chlann bhunaidh ina n-airchinnigh in Ail Finn ach scaipeadh iad go luath (sa 15 céad, is cosúil). Tá Groogan agus Grugan i nDoire - clann faoi leith, déarfainn. Fréamh: grúg = fearg, ceaptar. MIF.|
DEDs where Grugan and a second surname are found together