Laffan / la Font. Anglo Norman origins. They were in Co. Tipperary in the north - east of the Munster Province and Co. Wexford in the south - east of Southern Leinster in the 14th Century AD.

O Lafferty. See - O Laverty.

Mac Lafferty. Used as a variant for Mac Laverty, which see.

O Laffey. See - O Lahiff.

Lagan. Used in Co. Antrim in the north - east of the Ulster Province as a synonym with Logan, which see.

Laggah -

Lahart. See - Laherty.

O Laheen - Irish / Ua Laithin / Ua Fhlaithimhin. See O Flahavan.

O Laherty. Used as a variant for O Lafferty, which see. See also O Laverty.

O Laherty or O Lahart. A Sept / Family branch, who had their territory in Co. Kilkenny in the south - west of Southern Leinster and nearby in Co. Tipperary in the north - east of the Munster Province.

O Lahiff or O Lahive or O Flahy or O Flahive - Irish / Ua Laithimh - flaitheamh / ruler. O Flahy used in Co. Clare in the north - west of the Munster Province. O Flahive used in Co. Kerry in the south - west of Munster. O Laffey used as a variant in Co. Galway in Southern Connacht.

Lahy. Used as a synonym for Lahiff, which see, in Co. Clare in the north - west of the Munster  Province, and for Leahy, which see, in Co. Kilkenny in the south - west of Southern Leinster.

Mac Lain. Used as an occasional variant for Mac Clean, which see.

O Lainey. A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Sept / Family branch. Ancestors - *88.Eogan the 1st King of Aileach (Cenel nEogain), *87.Niall of the Nine Hostages the 126th King of Ireland (Ui Niaill).

Laing. See - Lang.

Laird / lord. Scottish origins. Recent arrivals they were in the Ulster Province.

Lake -

Lalee. Used as a variant for Lawlee, which see.

Lally. See - Mullally.

O Lalor or O Lawler - Irish / Ua Leathlobhair - leath / half - lobhar / sick. This was the name of two early Irish Kings of Ulidia in the north - east of the Ulster Province.

O Lalor or Lawler or Lawlor - Irish / Ua Leathlobhair. An Irian Laeghis Ui Laoighis Sept / Family branch - of the O More / O Moore / Ui Mordha Sept / Family branch, who had their territory in Co. Laois  in the mid - north - west of Southern Leinster where they were one of "7 Septs of Leix." Kinsmen to O Brophy / O Brofie / Ui Broithe, O Cashin / O Kissane / Ui Casain, O Deegan / Ui Duibhgainn, O Doran / O Dorrian / Ui Deoradhain, O Dowling / Ui Dunlaing, Mac Gahan / Mac Geehan / Mageehan / Mheic Gaethain, Mac Keady / Mac Keadie / Mac Keddy / Mac Keedie / Mac Keedy / Mackeady / Mheic Ceadach, O Harrigan / O Harraghan / O Harahan / Ui hArraghain, Ui Liathain, Mac Lee / Mac Lea / Ui Laoidhigh, O Swords / O Sord / O Sourdes / O Suard / Ui Suaird. They ruled there along with the O Deevys, the O Dorans, Mac Evoys, O Kellys and O Mores and Dowlings even after the Anglo - Norman Invasion. The alliance between the Septs began after the 3rd Century AD when the direct ancestor of the O Mores came into Co. Laois from out of the Ulster Province led by *69.Laoighseach "Cean Mor" a son of *68.Conall "Cearnach" / of the Victories from the Red Branch Warriors of Ulster. (Co. Laois is named for *69.Laoighseach.) He assisted 86.Cu "Corb" the direct ancestor of the Heremonian Ui Laoghaire Ui Lughaidh Cu Corb Kings of Leinster to drive the men from the Munster Province out of Mogha's Half there. They became the sub - kings there and they held together all through the six ethnic and religious rebellions under Elizabeth 1^st until they were dispersed and relocated elsewhere. They were to be cleared out of Cloneagh in Co. Laois twice by the English. Still in the Leinster Province. Ancestors - *83.Fachtna, *82.Milige, *81.Bran, *80.Eircc "hUbulchind," *79.Felim / Feidlimid mheic Finnchad, *78.Fiachach "Uanchind," *77.Daire, *76.Rossa, *75.Ogomain, *74.Fergus, *73.Muleist, *72.Fachtna, *71.Milige (Ui Baccan), *70.Intait, *69.Lugdach "Loichsi" / Laoiseach "Ceann Mor" the ancestor of the O More / Moore / Siol Morda Sept in Co. Laois (named for him) in the north - west of Southern Leinster who were among the ”7 Septs of Laois, *68.Conall "Cernach" - of the Victories the leader of the Knights of the Red Branch of Ulster who is the direct ancestor of the Mac Guinness, Mac Gowan and many other Irian Families in the Ulster Province and the Connacht Province. (He was a contemporary of Cuchulainn), *67.Aimhirgin "Larghiunach," *66.Cas, *65.Fachtna, *64.Cathbladh, *63.Cionga,  *62.Rory / Ruaidri “Mor” - the Greater who died in 218 BC as the Irian 86th King of Tara / Erinn (Clann - na - Rory), *37.Ir (Irians)..