Clan McShane (MacSeain, Johnson, McSean, Shane, O'Cheyne, MacEoghan, McOwen) 

Modern: Leinster 
Closely linked and blood related to The Ó Neills Mor, Clanaboy and the Fews. A traditional Ulster herding/warrior clan descending originally from Niall of the Nine Hostages. McShanes hereditary title is that of "a Chief of Moy Ith or Mag Itha" a plain going from the eastern Donegal border to southern Derry through Tyrone.Originally centered in the area to the west of the shore of Lough Neagh, between Dungannon and Maghera (Counties Derry and Tyrone). 
Clan O'More Clan-Na -Rory  (Mhordha, Moore, More) 
The line from the Ulsterman, Conall Cernach-of the Loígis Tribe of the Moores/ O'More. The name Mhórdha is now O'More The Loígis, Laígsi or Laoighisi, were mercenary tribes of the Laigin and probably of Cruithin (Pict) origin. The Loígis claim descent from Lugaid Loígsech, son of Conall Cernach. From Conall's line also descend the Dál n-Araide of Ulster. We also have some fame from the uprising of Chief Rory O'More. Today we are closely linked with the O'Carrolls. 

Clan McCain (Mac Úí Catháin, McCain) 

They descend from Manus Catha Duinn Úí Catháin (Manus of the battle of Down, killed in 1260), and along with their association with the Bush River were known as Clann Manus na Buaise (Clan Manus of Bush River). The Clan McCain has it's origins as the branch of the Clann Úí Catháin (O'Cahan) who lived and operated east of the Bann River in North Antrim as early as 1270, with descendants still living in the vicinity and worldwide. Their sphere of influence encompassed the area known as "The Route" (Rúta), particularly surrounding the Bush River (Buaise), its valley and north to Dunseverick on the coast. They held the castle of Dunseverick as their seate from circa 1610 to 1651. They were tightly allied and related to the Eoghnacht clans, particularly the Úí Naill (O'Neil), and later with the Irish Mac Dónaill (Eoin Mhóir) and the Earls of Antrim.
Ó Neill (Fews)Ancient Oneill Clan Ó Neill   (Ui' Naill, O'Neal, Neill, Neale) 
The Clan of the ancient Ulster Kings. Both Ó Neill Clans descend from Niall of the Nine Hostages. His kingship assured Ó Neill power in Ulster. Centuries later, a split in the family led to the formation of The Ó Neill Mor and The Ó Neill Clanaboy. Today both of these septs exist and flourish. Clan Ó Neill represents those Ó Neills in counties Tyrone, Derry, Armagh, Antrim, Donegal and septs throughout the mid and southern Ireland.We have strong clan organizations in Canada, the USA, Australia, New Zealand and in the UK. 
Clan MacShort (McAnghearre, Short, Shortt, Shorte, Schorte, Shortte, McShort, MacShortt, McShortt, O'Girr, Girr, Gearre, Gear, McGirr, MacGirre) 
They came over to assist the Irish Kings in their wars and make up their armies. The Clan is newly organized and led by the Baron Castleshort. One of the early and strongest galloglas or "foreign Swords" families to enter Ireland from Scotland. 
Clan O'Cahan Clan O'Cahan  (O'Cathain, O'Cahan, Keane, Kean, O'Kane, Kane, Cain, McCain).  
The O'Cahan line branched off through Fergal's son, Conchobar, and is the senior cadet branch of the Ó Neills. Known as "The Warrior Clan of Ulster". The eponymous ancestor of the O'Cahan Clan of Ulster was Cathain, who lived in the 9th Century, a descendant of Fergal mac Mael Duin, King of Tara (d. 772 A.D.), ancestor of the Ó Neill Royal dynasty. The O'Cahan family were under-kings (ur-righ) of the Ó Neill dynasty and bore the titles "King of Limavaday, Kianaght, and Fir-na-Creabh" (the latter now the Barony of Coleraine). They also were the hereditary inaugurators of the Ó Neill Kings. In Ulster the name is now usually found as Kane or O'Kane in Co. Derry, while in north Antrim the form McCain is often found. 
Clan O'Reilly  (Uh' Raghailligh, Riley, Reilly, O'Rahly)    
The modern clan was founded and organized by Susan Riley Leppard. Cavan clan is one of the most prominent families in the Cavan-Fermanagh areas. The O'Reillys were the Kings of East Breiffne in Gaelic times and maintained their dominance over the region long after the Plantation and the conquests of Ireland.Today the clan has membership in Ireland, UK, Canada, Australia and the US. O'Reilly and its spellings is the most common of all Irish surnames. 
Clan Cassidy  (Cassity, Cassedy and Casada)  
The Cassidy Clan is a perpetual hereditary association of people bearing the Cassidy surname, or having descended from an ancestor with the Cassidy surname, or any of the variant spellings of Cassidy, chiefly from County Fermanagh. 
Clan Maguire (Maguidhir)
Donn Carrach Maguire, who was the first Maguire king, died in 1302. At the beginning of the seventeenth century when the Irish were finally defeated, Fermanagh was simply a Maguire property. It was in Lisnaskea that Donn Mor Maguire seems to have established them, about 1200 AD. With help from the O'Donnells that the Maguires took the kingship of Fermanagh. They could have descended from one of the old Leinster Fermanagh families, perhaps Oriel. One of Fermanagh's premier families during the Middle Ages, and are still the most common family today in that county. 
Clan O'Donnell Cumann Chlann Dálaigh Cumann Chlann Dálaigh, or the O'Donnell Clan Association (Donegal) 
Clann Dálaigh might be a strong coherent Clan. 
Clan Gallager    
The O'Gallaghers claim to be the senior and most loyal family of the Cenéal Conaill (kindred of Conal Ghulban), son of Nial Nóigiallach "of the Nine Hostages," - who was high king at Tara circa 450 AD. The name of the sept, signifies descendantof Gallchobar or Gallagher (about 950 A.D.), who was himself descended from Maolchobha, King of Ireland who reigned from 642-654. The clan's territory extended over a wide area in the northern baronies of Raphoe and Tirhugh, Co. Donegal. The principle branch of the sept were seated at Ballyneit and Ballynagla ck.  
Clan McLaughlin
From Aodh Finnlaith's son, Niall Glundubh, descend both the McLaughlins and the Ó Neills, their kinsmen and rivals for the kingship of Aileach, the leading dynasty of the north of Ireland. The McLaughlins were direct descendants of Niall Mor or Niall 'of the Nine Hostages,' the great High King of Ireland who by legend was slain in 405 A.D. on a military expedition to the banks of the Loire in Gaul. Seated in Inishowen in Tirconnell (Donegal) The McLaughlins of Cenél Eoghainn are descended from Aodh Finnlaith, the Irish Ard Ri or High King who died in 876 A.D. 
Clan O'Quinn   O'Cuinn, O'Quinn, O'Quin, Quin, Quinn Correct form is O'Cuinn 
A famous Ulster family with septs in many counties outside Ulster as well. There are many distinct septs and branches and it is Ireland's 19th most numerous surname-regional clan and history. A Gaelic surname meaning descendants of Conn, which meant 'wisdom', or 'chief', or 'freeman', and of which there were many distinct Septs 
Clan Donnelly   
The word Donnghaile translates to "Brown Valor" or "Brown-haired Warrior." The Donnellys originally were a division of the clan Cineál Eoghain who derive their descent from Donnghal the fourth in descent from Domhnall, King of Aileach -- brother of Niall Glundubn and ancestor of the Ó Neills, the chief family of ancient Ireland. The clan served as the Chief Marshalls of Ulster until the end of the Nine Years War in 1603. Were the foster family of Shane Ó Neill the last great Ó Neill Mor. O'Donnghaile in Irish, from Donnghaile. The prefix "O" denotes one who is the ancestor of Donnghaile. 
Clan Bisset (Biseth)  Active in Counties Antrim, Derry, Down 
The Bisset(t)s were a Norman family who followed William into England in 1066. BISSET(T) Lord of Aboyne who was exiled he and his nephew Walter killed his brother in law the young Earl of Athol. Through marriage of a Bisset daughter in Ireland, the Ian Mor McDonald (The Tanist) acquired the title of Antrim and their descendants are now McDonnell, Lord of Antrim. The Antrim BISSET(T)s were descended from Sir Walter BISSET(T)'s nephew John or Eoin who was also exiled from Scotland for his supposed part in the death of the Earl of Athol. In Ireland the family interacted with the Irish Chieftains and became powerful in their own right as the McEoin-Bissets of the Glens. They were allies of the MacQuillian of the Route the McShanes, and the Ó Neills Clanaboy. 
Clan Cannon   
The family traces its ancestors from the west of Ireland bearing the name. CANNON or any of its derivatives such as: Canning, O'Cannon, Cannan, Canon, UiCanannain or any other similar name. The family is active in Tir Connell area of modern Donegal.
Clan McCartan 
An early Irish pedigree deposited in the National Library of Ireland traces the line further back in time to Rudricus Magnus, the tenth King of Ulster at Emain Macha (Navan Fort). McCartan owes its origin to the Gaelic Mac Artán which translates 'son of Artán '. The annals record that Artán died in 1004. In 1600 the McCartans were still fairly strong and in control of mid County Down, with strongholds at Magheraknock, Ballynahinch, Magheratimpany, Loughinisland, Drumnacoyle, Drumaroad, Finnebrogue and Ardilea. 
Clan Marmion
The Marmions are a Norman-Irish family which entered Ireland with Strongbow in the person of Sir Robert Marmion. Clustering on the 'borderlands' in Carlingford from the 13th century, the family was prominent in the town. Highly visible in rebellion from 1641, then captain-of-the-nation 'Patrick Marmion, Papist' lost his castle, mill, and other extensive properties in Carlingford in 1652 via Cromwellian confiscation. Many Down Marmions were also in rebellion from 1641. After the Restoration the Marmions surfaced actively again in Dundalk and Down and they remain to this day. Branches of the family went into County Down, Lecale barony primarily by the 1500's. 

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