O Lavelle. Originally Mulfaal - Irish / Ua Maolfhabhail / faball (movement). A Sept / Family branch, who had their  territory in Co. Mayo in the mid - west of the Connacht Province and were also in Co. Donegal in the north - west of the Ulster Province. Also corrupted to Fall and Melville, which see.  

O Laverty or O Lafferty or O Laherty - Irish / Ua Flaithbheartaigh. Heremonian Dal Cuinn "northern: Ui Niaill Cenel nEogain Clann Domhnaill na Dalaigh Sept / Family branch, who had their territory in Co. Donegal and nearby in Co. Tyrone in the Ulster Province where they were the Chiefs of Aileach and the Tanaiste / Princes of Co. Tyrone in Central Ulster. Etymologically the same as O Flaverty. Ancestors:  *102.Aed Findliath the 25th Cenel nEogain King of Aileach and 168th King of Ireland, 103.Donnell the 28th Cenel nEogain King of Aileach who died in 915 AD.

Mac Laverty - Irish / Mheic Fhlaithbheartaigh. A Sept / Family branch, who had their territory in the Ulster Province. May be akin to O Laverty, which see.

O Lavery or O Lavary or O Lowry - Irish / Ua Labradha / labraidh (spokesman). They had 3 Septs / Family branches, O Lavery Baun / ban (White), O Lavery Roe / rua (Red), O Lavery Trin / trean Strong). Some of those from the Trin Sept changed their name to Armstrong. Their territory was in Co. Antrim and nearby in Co. Down in the east of the Ulster Province.

Mac Lavery Heremonian Dal Cuinn Colla Da Crioch Airthir Ui Echdach Ui Echach Orior Siol Ciarain Ui nEchach Clann Ruadhagain Sept / Family branch, who had their territory in the north of Co. Armagh in the south - east of the Ulster Province and nearby in Co. Down. Especially see Mac Glory.

Lavey. May be a variation of Leavy, which see, who were in Co. Longford in the north - west of Northern Leinster and it was also used nearby in Co. Westmeath in the south - west of Northern Leinster.

O Lavin - Irish / Ua Laimhain / Ua Limhin / Lamhain. May have been originally flaithimhin (ruler). Heremonian Dal Cuinn Ui Briuin Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province under the Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Ui Briuin Mac Dermots. Some changed to Hand by mistranslation. Ancestors: *89.Eochy Mugmedon the 124th King of Tara / Ireland.*90.Brion the first Dal Cuinn King of Connacht (Ui Briuin),

O Lavin or O Lavan. Heremonian Dal Cuinn Colla Da Crioch Siol Daim Argait Sept / Family branch who had their territory in Co. Fermanagh in the Ulster Province. Ancestors: *86.Cairbre Liffeachair the 117th King of Tara / Ireland. 87.Eochy / Echu Doimhlen,  88.Murray / Muireadach Colla Da Crioch / Focrith - of the Two Countries,  89.Rochadh,  90.Dega Duirn, 91.Feicc, 92.Criffan / Crimthann Leith / Lethan, 93.Eochy / Echach, 94.Cairbre / Cairpre an Daimh Argait, 95.Cormac (Mac Guire - Uidhir), 96.Aodh / Aed, 97.Fergus, 98.Cormac, 99.Eignigh / Eigneach / Fechin, 100.Irgalach / Iargallach, 101.Lugan / Luan, 102.Cearnach, 103.Odhar / Uidhir - of the Brown Hair, 104.Dalach (O Lavin), 

Mac Lavin. See Mullavin.

Law or Lawe. English origins in the north - east of the Ulster Province.

Lawder or Lauder / laidir (strong). They were in the Leinster Province.

Lawell. Used as a synonym for Lavelle, which see.

Lawlee. English origins used as a synonym for Lawley, which see. They were initially in Co. Westmeath in the south - west of Northern Leinster and also in the Ulster Province and Co. Cork in Southern Munster.

Lawless or Lawles / Laighleis / laghles (outlaw). English origins into Ireland after the Anglo - Norman Invasion and were initially one of the 10 Foreign Tribes of Kilkenny in Co. Kilkenny / Ossory in the south - west of Southern Leinster with territory also nearby in Co. Dublin in the north - east of Southern Leinster, with one of their members becoming a Burgess of Kilkenny City in 1396 AD. They are now to be found in Co. Galway and nearby in Co. Mayo in the mid - west of the Connacht Province and Co. Dublin in the north - east of Southern Leinster.

O Lawler or O Lawlor or Lalor - Irish / Ua Leathlobhair. Gaelic Milesian Irian Ui Laeghis / Ui Laoighis Sept / Family branch of the O Mores / O Moore / Ui Mordha Sept who were Irian Chiefs who had their territory in Co. Laois  in the mid - north - west of Southern Leinster where they were one of "7 Septs of Leix" and were also in Co. Down in the south - east of the Ulster Province. Especially see O Lalor.

O Lawlor or O Lalor. Heremonian Dal Cuinn Colla Da Crioch Sept / Family branch.

O Lawn - Irish / Ua Liathain. Heremonian Dal Cuinn Ui Fiachrach Sept / Family branch, who had their territory in Co. Sligo in the north - west of the Connacht Province. Etymologically similar to O Lehane who were in Co. Cork in Southern Munster. Ancestors: 90.Fiachra the second Dal Cuinn King of Connacht (Ui Fiachrach), *89.Eochy Mugmedon the 124th King of Tara / Ireland.

Lawrence or Laurence, English origins in Ireland since the Mid - 17th Century AD. See also St. Laurence.

O Lawry. A Sept / Family branch, who had their territory and were Chiefs in Co. Down in the south - east of the Ulster Province.

Mac Lawson - Irish / Laburais. Heberian Eoghanacht Chaisil Sept / Family branch of the O Sullivans of Beare 

Lawson. English origins in the Ulster Province since the early 17th Century AD after the confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn "northern" Ui Niaill territories and the foreign non - Catholic plantations there.

O Lawton or O Loughnane, which see, Irish / Ua Lachtnain / lachtna (grey). An English name used to anglicize their name in Co. Cork in Southern Munster.

Layd -

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