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.|
|Ó Lochlainn||rare: Galway etc. Ir.Lang. See Loughlin.|
|Ó Lochlainn||O'Loughlin, Loughlin: líonmhar tríd an dtír: in Ultaibh, Connachta, an Clár go sonrach. Clann a bhí i gceannas i gCorca Modhruaidh (Deoise Chill Fhionnabhrach anois). Tá meascadh le Mac Lochlainn sa tuaisceart agus in Oirghialla deineadh Loughlin agus Laughlin díobh.|
|O'Loghlen||Quite numerous: Clare etc. Ir. Ó Lochlainn. A sept of the Burren, N Clare. See O'Loughlin.|
|O'Loughlin||numerous: all areas, especially Clare. Ir. Ó Lochlainn, from a first name of Norse origin. A sept of Clare located in the Burren. IF.|
DEDs where O'Loughlan and a second surname are found together