Mac Lamond. Highland Scottish origins - see Mac Lamont  and Mac Clement etc.

 Mac Lamont. Highland Scottish origins. They were in Co. Tyrone in the Ulster Province. Mac Lammon was also used as a variant. See also Mac Clement, Mac Lamond, Mac Lymon and Clements.

Lamport. An older form used for Lambert, which see, in Forth in Co. Wexford in the south - east of Southern Leinster.

Lancaster -

Landers / Londraigh. They were in Co. Limerick in the mid north - west of the Munster Province.

 Landers or Landry or Londra / de Londras - Originally de Londres (of London). They were in the Munster Province. Glanders was also used as an occasional variant. See also Gillanders.

O Landrigan or O Ladrigan. Used as variants for O Lonergan, which see.

Mac Landrish. See - Mac Gillanders.

Landry. See - Landers.

Landy / de la Launde (of the a glade) Gaelicized as Leaindi. Anglo Norman origins. They have been in Co. Kilkenny in the south - west of Southern Leinster and Co. Tipperary in the north - east of the Munster Province since the 13th Century AD.

Lane. Used by the Irish Families of Lehane, Lyne and Lyons, which see, to anglicize their names. Mostly found in Co. Cork and Co. Limerick in the Munster Province.

Lane or Lany. English origins -

Mac Lane. Used as a variant for Mac Lean, which see.

O Lanes. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Sept / Family branch. Ancestors - *85.Murray / Muiredach "Colla da Crioch" / "Focrith" - of the Two Countries, *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

O Lang - Irish / Ua Lainn. See O Lyng.

Lang. Scottish origins from the Clan Leslie. They were in the north of the Ulster Province.

O Langan or O Long - Irish / Ua Longain / long - tall. A Sept / Family branch who were the Chiefs in their territory in Co. Armagh in the south - east of the Ulster Province. Known as O Langan in Co. Mayo in the mid - west of the Connacht Province although from Co. Armagh originally. See also O Long. They were also in Co. Meath in the south - east of Northern Leinster.

 Langford. English toponymic origins. In the 16^th Century AD they were in the Ulster  Province and later in Co. Limerick and Co. Kerry in the west of the Munster Province.

Langrishe or Langrredge. English origins. They were in Co. Kilkenny in the south - west of Southern Leinster in the Mid 17^th Century AD.

Langton. One of the "10 Foreign Tribes of Kilkenny."

O Lanigan - Irish / Ua Lonagain. A Sept / Family branch, who had their territory and were Chiefs in Co. Tipperary in Ormond / Aur Mhumhain / North Eastern Munster and the surrounding region.

O Lannigan - Irish / Ua Lonagain.  A Sept / Family branch, who had their territory in the west of Co. Cork in Desmond / Des Mhumhain / Southern Munster. See also Lennon.

O Lannon. Used for O Lennon, which see, in Co. Kilkenny in the south - west of Southern Leinster.

Lansdowne. Descendants of Sir William Petty.

Laphin. Used as a variant for O Lappin and Laffan, which see.

O Lappin - Irish / Ua Lapain. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. They are now found mainly in Co. Armagh and nearby in Co. Tyrone in Ulster. Some also changed to Delap, which is also used as a synonym for the Scottish name Dunlop in Co. Derry and Co. Fermanagh in Ulster. Delap also used in the Connemara in the south - west of  Co. Galway and Co. Mayo in the south - west of the Connacht Province.

 O Laracy. See - O Larrissey.

O Lardner - Irish / Ua Lorgnain. A Sept / Family branch, who used it to anglicize their name in Co. Galway in Southern Connacht. Not connected to the O Lerhinans - Irish / Ua Loirgneain. 

Lardner. English origins -

Mac Lardy. Highland Scottish origins. A Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla Uais Sept / Family branch of the Mac Donalds. They were mainly in Co. Antrim in the north - east of the Ulster Province and in Ulster generally. Ancestors - *85.Carroll / Cairell "Colla Uais" the 121st King of Tara / Ireland (Ui Mac Uais), *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

O Largan - Irish / Ua Lairgneain. A Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla Sept / Family branch, who had their territory in Co. Down in the south - east of the Ulster Province in the kingdom of Orghialla / Airghialla / Oriel. See also - O Lerhinan. Ancestors - *84.Eochy / Echu "Doimhlen," *83. Cairbre "Liffeachair" the 116th King of Tara / Ireland.