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:
McKinnon, MacKinnon or Mackinnon is a Scottish surname.,
MacLean, also spelt Maclean and McLean, is a Scottish Gaelic surname Mac Gille Eathain, or, Mac Giolla Eóin in Irish Gaelic), Eóin being a Gaelic form of Johannes (John). The clan surname is an Anglicisation of the Scottish Gaelic "Mac Gille Eathain", a patronymic meaning "son of Gillean". Gillean means "the Servant of [Saint] John [the Baptist]"), named for Gilleathain na Tuaidh, known as "Gillian of the Battleaxe", a famous 5th century warrior.
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.
The surname Collins has a variety of likely origins in Britain and Ireland:
Lindsay is a Scottish surname and 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.
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 in the English language. The name 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.
Donnelly is an Irish surname. Also used as: O’Donnelly or Donley. It is derived from the Gaelic Ó Donnghaile meaning 'descendant of Donnghal', a given name composed of the elements donn and gal ('valour'). O'Donnelly was historically of the Northern Uí Néill's Cenél nEoghain, descended from Donnghal, the great-grandson of Domhnall, King of Ailech.
Conway is a Welsh, Irish & Scottish surname. It can be an anglicised spelling of Conwy, Mac Connmhaigh, Ó Connmhacháin, or the Scottish Coneway.
Crowe is a surname of Middle English origin. Its Old English origin means 'crow', and was a nickname for someone said to resemble this bird, probably if they had very dark hair. The name is historically most common in the English Counties of Norfolk and Suffolk particularly around the City of Norwich. The name may alternatively have a Irish origin: in Ireland, it may originate as an anglicisation of Mac Enchroe a clan of munster while in the Isle of Man it represents an anglicised version of Mc Crawe (1540).
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.
Rory is a given name of Gaelic origin. It is an anglicisation of the Irish: Ruairí/Ruaidhrí and Scottish Gaelic: Ruairidh/Ruaraidh and is common to the Irish, Highland Scots and their diasporas. The meaning of the name is "red king", composed of ruadh ("red") and rígh ("king").
The Maguire family is an Irish clan based in County Fermanagh. The name derives from the Gaelic Mac Uidhir, which is "son of Odhar" meaning "dun", "dark one". According to legend, this relates to the eleventh descendant of Colla da Chrich, great-grandson of Cormac mac Airt, who was monarch of Ireland about the middle of the third century. From the 13th to the 17th centuries, the Maguire family were kings of Fermanagh.