Quick answer: McGrath comes from Irish Mag Raith and Mac Craith, “son of Mac Raith.” Patrick Woulfe records notable family traditions in Donegal, Thomond and Waterford, giving the surname a rich history in both ecclesiastical and learned life.
Browse the McGrath Irish Family Crest gift collection for blankets, apparel and keepsakes.
What does McGrath mean?
The surname is patronymic and comes from the personal name Mac Raith, which Woulfe connects with grace or prosperity. Historical records use forms including Mag Raith, Mac Craith, Magrath and McGrath, reflecting changes in Irish spelling and English-language recording.
Donegal and Termon Daveog
One northern family served as coarbs of St Daveog and erenaghs of Termon Daveog near Lough Derg in County Donegal. Termonmagrath Castle near Pettigo preserves that regional association in the landscape. This Donegal tradition gives the surname an important connection with medieval church lands and hereditary office.
The learned McGraths of Thomond
Woulfe also records a Thomond family known as hereditary poets and chroniclers to the O’Briens. Their work belongs to Ireland’s learned Gaelic tradition, in which professional families preserved history, praise poetry and genealogy for regional rulers.
Waterford and other family traditions
An influential Waterford family and additional regional groups add further chapters to the name. Woulfe also notes a Scottish MacCraith family of Kintail with later links to north Ireland. For researchers, those documented traditions make locality an especially useful guide.
Spelling variants and migration
Search McGrath, Magrath, MacGrath, MacCraith and Mag Raith. A single household may appear under more than one form, particularly when records move between Irish and English or when families emigrate. County, parish, occupation and relatives help connect those spellings.
How to research McGrath ancestors
- Search civil records through IrishGenealogy.ie.
- Use the 1901 and 1911 censuses to locate households.
- Check parish registers, valuation records, wills and local histories for the relevant county.
- For Donegal research, look for Termon Daveog and Pettigo references in parish and estate records.
- For emigrant families, compare Irish records with passenger lists and overseas censuses.
McGrath surname FAQ
Where does the McGrath name come from in Ireland?
From the personal name Mac Raith. The Donegal family were coarbs of Termon Daveog, the Thomond family were poets to the O’Briens, and Miler Magrath of the Termon family became Archbishop of Cashel.
Which areas are most important?
Donegal, Thomond and Waterford all have documented McGrath traditions.
Why are there so many spellings?
Irish-language forms, English recording and migration produced several closely related spellings over time.