Longain -  Loughlin

O Longain - Irish - Ua Langain. A Sept - Family branch - who had their territory in Co. Armagh in the south - east of the Ulster Province.

O Longan - A Sept - Family branch - who had their territory in Co. Down in the south - east of the Ulster Province.

O Longan - Irish - Ua Longain - long - tall .A Co - Arb Sept - Family branch - who had their territory in Co. Limerick in the mid - north - west of the Munster Province. Often confused with the Ui Longaigh / See Long.

O Longergan - A Heberian Dal gCais Ui Bloid Sept - Family branch who had their territory in Co. Clare in the north - west of the Munster Province. Descended from one of the 5 sons of *103.Lorcan the Ui Turlough Chief in Thomond - Northern Munster in 900 AD. His father was a brother to 104.Kennedy the direct ancestor of the O Kennedys & O Brians - Briens of Munster. Many variants. Ancestor *91.Cas.

Longfield -  English origins.  They were in Co. Cork in Southern Munster since the Mid - 17th Century AD.

Lonnain - They were in the west of Co. Cork in Southern Munster. See Lennon - Lenane.

O Looby - See Luby.

O Loonan or Loonane - Irish - Ua Luanain - luan - hound or warrior. A Sept - Family branch - who had their territory in Co. Longford in the north - west of Northern Leinster.

Mac Loone - Used as a variant for Mac Glone, which see - Irish -  Mheic Colluin. A Sept - Family branch - who had their territory in the Glenties in Co. Donegal in the north - west of the Ulster Province. Mac Aloon also used there.

O Looney - Irish - Ua Luanaigh. A Sept - Family branch - who had their territory in Co. Clare in the north - west of the Munster Province and were also in Co. Cork in Southern Munster. Not connected to Lunney or Lowney.

O Looran or Loran - Used as variants for Loughran, which see, in Co. Meath & Co. Westmeath in Northern Leinster.

Lord - Used as a synonym for Kiernan & Tierney, which see - Irish - tighearna - lord. 

Lord - English origins. They were in Co. Dublin in the mid - east of Southern Leinster & Co. Westmeath in the west of Northern Leinster in the Mid - 17th Century AD.

O Lordan - Irish - Ua Lordain. A Sept - Family branch who had their territory in the west of Co. Cork in Southern Munster.

Lorimer -

Mac Lorinan - See Mac Larnon.

O Lorkan or Lorkin - Used as variants for Larkin, which see.

O Lorrigan - Used as a variant for Lonergan, which see.

Mac Loskey - Used as a variant for Mac Cluskey, which see.

O Losty - Irish Ua Loiste. A Sept - Family branch - who had their territory in Co. Donegal in the north - west of the Ulster Province.  Lasty, Lastly & Lusty were used as variants. Leslie also used as a synonym.

Lough - Scottish toponymic origins. Used as a variant for Loch, which see. They have been in the Ulster Province since the early 17th Century AD.

O Loughan - See Lohan.

Lougheed - Scottish origins. Used as a variant for Lochead - head of the loch - akin to Kinloch - ceann an locha - in Gaelic, which see.

O Loughlin or O Lochlainn - Irish - Ua Lochlainn - loch - lake / lann - land. An Irian Sept - Family branch - of the Clan na Rory Tuath - Family region - descended directly from *Lochlann a Chief of their territory in Corcomroe in Co. Clare in the north - west of the Munster Province. *Lochlainn was descended from the Kings of Ulster who were in turn descended from *37.Ir the Milesian Gaelic Celtic brother who was drowned during the expedition to Ireland in 1699 BC. They were Chiefs of the Burren - Barony of the Burren - in the east of Corcomroe in Co. Clare and kinsmen to the O Connor Chiefs of Fear Arda & Corcomroe, the O Donnells, the O Baskins, the O Keelys and the O Kellys the Chiefs of Corca Baiscinn and the O Mulcoras there. *62.Rory “Mor” - the Greater was the Irian 86^th King of Tara - Erinn who died in 218 BC who is the ancestor of the Irian Families from the Clann na Rory. The son of his fifth son was *64.Fergus ”Mor” and his sixth son was the ancestor of *68.Conal “Cearnach” - the Victorious the leader of the Knights of the Red Branch of Ulster. *68.Conal "Cearnach" was also the forefather of the O Moores, Mac Guinness, Mac Gowans and many other important Irian Families in the Ulster Province, Leinster Province & Connacht Province. Ancestors *62 Rory "Mor" & *37.Ir.

O Loughlin - Irish - Ui Lochlainn - loch - lake / lann - land. A Heberian Dal gCais Sept - Family branch - who had their territory in Co. Clare in the north - west of Munster Province. See also Loughnane. Ancestor *91.Cas.

Mac Loughlin or *O Melaghlin - Irish - Ui Maiolsheachlainn - (Descended from a devotee of St. Sechlainn) A Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Clann Cholmain Sept - Family branch - who had their territory in Co. Westmeath in the west of Northern Leinster. Directly descended from *104.Malachy 11 - Maol Sechlainn the 40th King of Meath & 169th High King of Ireland who died in 1022 AD. Later corrupted to O Melaghlin, which see, and then Mac Loughlin. Ancestor *88.Conall "Cremthainne."

Mac Loughlin or Mac *Laughlin - Irish - Mheic Lochlainn - loch - lake / lann - land. (Descended from a son of *104.Lochlainn. A Heremonian Ui Cobhthaigh Dal Cuinn "northern" Ui Niaill Cenel nEogain Sept - Family branch - who had their territory at Inishowen in Co. Donegal and in Co. Derry in the north - east of the Ulster Province. They were the most powerful family in Ulster during the middle -ages but lost their importance during the 13^th Century AD. Their name is usually anglicized there as *Mac Laughlin. Ancestor *88.Eogan.

Mac Loughlin - Irish - Mheic Lochlainn - loch - lake / lann - land. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Briuin Sept - Family branch - who had their territory in the Connacht Province where they were kinsmen to the Ui Briuin Ai Septs of the O Connors & Mac Dermots. Ancestor *87.Brion.

Mac Loughlin - Irish - Mheic Lochlainn. A Sept -    Family branch - who had their territory at Loughlinstown in Co. Dublin in the mid - east of Southern Leinster.