For background on how the map was made (and its flaws), see the relevant blog entry.
| Laughlin | fairly numerous: Belfast, Antrim etc. Ir. Lochlainn (Scandinavia). Perhaps for Mac Lochlainn from Norse first name Lachlan in Scotland. See O'Loughlin. |
| Loughlin | numerous: Ulster, Connacht, N Leinster etc. Ir. Ó Lochlainn, Lochlann, a first name probably meaning Viking. The best-known sept was of Dál gCais (Clare) and the name exists also as MacLoughlin, q.v. GPN. |
| Mac Lachlainn | Mac Laughlin (Éire), Mac Lachlan (Alba): leagan tuaisceartach de Mac Lochlainn, q.v. Bhí an chlann Albanach suite i Srath Lachlainn, Oirear Gael, agus iad líonmhar i gcónaí. |
| Mac Lochlainn | Mac Loughlin, Mac Laughlin: an-líonmhar: Tír Conaill, Doire, Cúige Uladh i gcoitinne agus ar fud na tíre. Ag fágaint clann ríoga na Mí, Ó Maoilsheachlainn (q.v.) ar leataobh, dírímís ar an gcraobh shinseartha d'Uí Néill an tuaiscirt, a bhí suite in Inis Eoghain; chailleadar forlámhas i 1241 ach bhí brainsí i Liatroim & rl. Sa 20 céad, thionscnaigh Tomás Mac Lochlainn (1896-1971) innealtóir, scéim hidrileictreach na Sionainne a chuir bonn faoi fhorbairt nua-aimsire na tíre. IF. |
| MacClaughlin | rare: Belfast area. Variant of Mac Laughlin, q.v. |
| MacCloughlin | Very rare: Antrim. See Mac Loughlin. |
| MacGlaughlin | Quite numerous: Dublin, Tyrone etc. Ir. Mag Lochlainn. See Mac Loughlin. |
| MacGloughlin | rare: Dublin etc. See Mac Loughlin. |
| MacLachlan | fairly rare: scattered. Ir. Mac Lachlainn. Scots form of Mac Lochlainn: Mac Loughlin, q.v. |
| MacLauchlan | Very rare: Fermanagh. See Mac Laughlin. |
| MacLaughlin | Very numerous: all areas, especially Donegal-Derry and Ulster generally. Ir. Mac Lochlainn, from a Norse first name. An important sept of the Northern Uí Néill, located in Inishowen (Donegal). Other septs existed elsewhere. Also as Mac Loughlin, q.v. SI. |
| MacLochlainn | rare: Donegal etc. Ir.Lang. See Mac Laughlin. |
| MacLoghlin | Very rare: Dublin. See Mac Loughlin. |
| MacLoughlin | Very numerous: all areas, especially Donegal and Ulster generally; Louth and N Midlands. Ir. Mac Lochlainn, from Norse first name meaning, perhaps, "viking". More usually Mac Laughlin in the North. There were two principal septs: one of the Northern Uí Néill; the other not Mac Loughlin at all but O'Melaghlin, descended from the High-King Maoilsheachlainn and located in Meath. IF. |
| Mag Lachlainn | athleagan de Mag Lochlainn, q.v. ach measctha le Mac Giolla t-Seachlainn. |
| Mag Lochlainn | Mac Glaughlin: líon beag: Tír Eoghain & rl. Athleagan ar Mac Lochlainn. |
DEDs where McLaughlen and a second surname are found together
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