Brennan is an Irish surname which is an Anglicised form of two different Irish language surnames—Ó Braonáin and Ó Branáin. Historically, one source of the surname was the prominent clan Ua Braonáin (O'Brennan) of Uí Duach (Idough) in Osraige who were a junior Dál Birn sept stemming from a younger son of Cerball mac Dúnlainge (d.888). Recent surname evaluations highlighted the geographic consistency of this lineage in the barony of Idough. However, based on the ultimate authority of Dubhaltach Mac Fhirbhisigh they are out of Ui Dhuinn (O’Dunn) and, therefore, an Uí Failghi tribe, not Osraige. While it is clearly apparent that O’Hart’s pedigree is erroneous, it is suggested that Ó Cléirigh probably became confused while transcribing from Mac Fhirbhisigh. This is echoed by the modern scholar, Bart Jaski.
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".
Doyle is a surname of Irish origin. The name is a back-formation from O'Doyle, which is an Anglicisation of the Irish Ó Dubhghaill, meaning "descendant of Dubhghall". There is another possible etymology: the Anglo-Norman surname D'Oyley with agglutination of the French article de. It means 'from Ouilly', the name of a knight who originated from one of the places named Ouilly in Normandy, such as Ouilly-le-Tesson, Ouilly-le-Vicomte, etc. The relationship with the family D'Oyly is unknown.
Doherty is an Irish surname. It is anglicized of the Gaelic Ó Dochartaigh.
Clancy is an Irish name coming from the Gaelic Mac Fhlannchaidh/Mac Fhlannchadha, meaning "Son of the red/ruddy warrior", or as a hypocorism for Clarence.
The surname Collins has a variety of likely origins in Britain and Ireland:
- English and Scottish: A patronymic surname based on the English and Scottish name Colin, an English diminutive form of Nicholas.
- Norse: From the Old Norse personal name "Kollungr", a form of "koli" which in Old English became 'Cola', meaning swarthy or dark.
- Irish: The medieval surname was Ua Cuiléin, which has usually become Ó Coileáin today.
- Welsh: Collen; "hazel, hazel grove".
Nolan is a surname, of Irish origin from Ó Nualláin, derived from Irish nuall meaning "noble, famous" combined with a diminutive suffix.
MacDonnell, Macdonnell, or McDonnell is a surname of Scottish and Irish origin. It is an anglicized form of the Gaelic patronymic Mac Dhòmhnaill, meaning "son of Dòmhnall". The Gaelic personal name Dòmhnall is a Gaelicised form of the name Donald, which is composed of the elements domno, meaning "world", and val, meaning "might" or "rule". The name is considered a variation of MacDonald.
Dillon is an Irish surname of Breton origin, descending from a cadet branch of Viscomte de Leon in Northern Brittany. It first appeared in Ireland with the arrival of Sir Henry de Leon, in the service of Prince John in 1185. Sir Henry married Maud de Courcy, daughter of Sir John de Courcy and Affrica Guðrøðardóttir. Awarded large tracts of land by in Meath and Westmeath, one of the Dillons’ first Mott & Baileys can still be found at Dunnamona before the establishment of stone structures such as Portlick Castle.
Foley is a surname which originated in Ireland, in the southeast Munster region. The name is derived from the original modern Irish Ó Foghlú and older Irish Ó Foghladha, meaning "plunderer". The Lord of the Decies was a title attributed to some early Foleys.
Kennedy, with variant forms O'Kennedy and Kennedie, is a surname of Irish and Scottish origin that has also been used as a given name.
Ryan is a common surname of Irish origin, as well as being a common given name in the English-speaking world.
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.
Dwyer is an Irish surname which is a slightly anglicised variation of O'Dwyer. It is said that people with the surname Dwyer and who come from Ireland all come from the same clan.
Humphreys is a common surname. Notable people with the surname include:
Cummins is a surname. Notable people with the surname include:
Purcell is a surname of Norman origin, and common in Ireland and England. It was given to those whose occupation was swineherd.
McKenna is a surname of Irish origin. It is the anglicized form of the Gaelic Mac Cionaodha meaning "son of Cionnaith", or of the Scottish surname, from Galloway, "MacCionaodha".
Hennessy is an Irish surname, being the anglicised form of Ó hAonghusa.
Kearney or Kearneys is an Irish surname.
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