| 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. |
Parishes where O'Loghlin and a second surname are found together
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