McGrath or MacGrath derives from the Irish surname Mac Craith and is occasionally noted with a space: e.g. Izzy Mc Grath. In Ireland, it is pronounced "Mack Grah" "Mick Grah" or "Ma Grah". In Australia and New Zealand it is pronounced MuhGrah.
Notable people with the surname include:
Fitzpatrick is an Irish surname that most commonly arose as an anglicised version of the Irish patronymic surname Mac Giolla Phádraig "Son of the Devotee of (St.) Patrick".
M(a)cLaughlin is the most common Anglicized form of Mac Lochlainn, a masculine surname of Irish origin. The feminine form of the surname is Nic Lochlainn. The literal meaning of the name is "son of Lochlann". Note that Mc is simply a contraction of Mac, which is also truncated to M' . Thus, MacLaughlin, McLaughlin and M'Laughlin are the same Anglicism, the latter two merely contractions of the first.
MacDonald, Macdonald, and McDonald are surnames of both Irish and Scottish Origin. In the Scottish Gaelic and Irish languages they are patronymic, referring to an ancestor with given name Donald.
O'Connor is a surname. Notable people with the surname include:
Costello is a surname of Irish origin, which has been used as a stage name by Italians and others.
Flynn is an Irish surname or first name, an anglicised form of the Irish Ó Floinn or possibly Mac Floinn, meaning "descendant or son of Flann". The name is more commonly used as a surname rather than a first name.
Kennedy, with variant forms O'Kennedy and Kennedie, is a surname of Irish origin that has also been used as a given name.
Lindsay is both a Scottish surname and a given name. The given name comes from the Scottish surname and clan name, which comes from the toponym Lindsey, which in turn comes from the Old English toponym Lindesege for the city of Lincoln, in which Lind is the original Brittonic form of the name of Lincoln and island refers to Lincoln being an island in the surrounding fenland. Lindum Colonia was the Roman name of the settlement which is now the City of Lincoln in Lincolnshire. Lindum was a Latinized form of a native Brittonic name which has been reconstructed as *Lindon, which means "pool" or "lake" and refers to the Brayford Pool.
O'Malley is an Irish surname. According to historian C. Thomas Cairney, the O'Malleys were the chiefly family of the Partraige who were a tribe of the Erainn, the second wave of Celts to settle in Ireland between about 500 and 100 BC.
Duffy is a surname of Irish origin that comes from the original Irish name Ó Dubhthaigh, meaning descendant of Dubthach. Dubthach was an Old Irish first name meaning "black".
Burke is a Norman-Irish surname, deriving from the ancient Anglo-Norman and Hiberno-Norman noble dynasty, the House of Burgh. In Ireland, the descendants of William de Burgh had the surname de Burgh, which was gaelicised in Irish as de Búrca and over the centuries became Búrc, then Burke, and Bourke.
Hunt is an occupational surname related with hunting, originating in England and Ireland. In Estonia, the surname Hunt is also very common, meaning wolf in the Estonian language.
Kelly is a surname of Irish origin. The name is a partially anglicised version of older Irish names and has numerous origins, most notably from the Ui Maine. In some cases it is derived from toponyms located in Ireland and Great Britain; in other cases it is derived from patronyms in the Irish language.
Casey is a common variation of the Irish Gaelic Cathasaigh/Cathaiseach, meaning vigilant or watchful. At least six different septs used this name, primarily in the counties of Cork and Dublin.
Keogh is an Irish surname. It is a reduced Anglicized form of the Gaelic Mac Eochaidh or MacEochaidh, 'son of Eochaidh'. The personal name Eochaidh is in turn based upon the Gaelic word for horse.
Conway is a Welsh, Irish & Scottish surname. It can be an anglicised spelling of Conwy, Mac Connmhaigh, Ó Connmhacháin, or the Scottish Coneway.
The name Moriarty is an Anglicized version of the Irish name Ó Muircheartaigh which originated in County Kerry in Ireland. Ó Muircheartaigh can be translated to mean 'navigator' or 'sea worthy', as the Irish word muir means sea and ceardach means skilled. Several prominent people have the Irish name Moriarty, mostly as a surname.
Quinn is an Anglicised form of the Irish Ó Coinn or Mac Cuinn. The latter surname means "descendant of Conn". The surname Quinn is also rendered Ó Cuinn or Mac Cuinn in Irish. The surname is borne by several unrelated families in Ireland, especially in the northern province of Ulster and also the counties of Clare, Longford, and Mayo. According to the historian C. Thomas Cairney, the O'Quins were part of the Conmaicne Rein tribe in Ireland who came from the Erainn tribe who were the second wave of Celts to settle in Ireland from about 500 and 100 BC. The most notable family of the name are that of Thomond, a Dalcassian sept, who derive their surname from Niall Ó Cuinn who was slain at the Battle of Clontarf in 1014. This family was formerly represented by the Earls of Dunraven. Another family is that seated in Annaly, who were related to the O'Farrell lords of Longford. Another Quinn family was seated at An Chraobh, County Tyrone and they were related to the O'Neill Kings of Tír Eoghain and for whom they acted as Hereditary Quartermasters. Other families include one seated in Antrim; one seated in Raphoe; and one called Clann Cuain, seated near Castlebar. In the seventeenth century, the surname Quinn was common in Waterford. In 1890, the surname was numerous in Dublin, Tyrone, Antrim, and Roscommon. Quinn is one of the twenty most common surnames in Ireland. the surname Quinn is sometimes associated with Catholics, while Quin is associated with Protestants.