| Fada | Long: bua-aidiacht a ghlac áit an tsloinne bhunaidh ach ní dócha go bhfuil sé coitinn. |
| Lenane | rare: Cork etc. See Linnane. |
| Lennan | Very rare: Dublin. See Lennon. |
| Lennon | Very numerous: Ulster generally, South East, E Galway-Mayo etc. Ir. Ó Lionáin, ó Ó Leannáin. The derivation may be from leann, a cloak, or leannán, a lover, paramour. In any event, there were distinct septs in Fermanagh, Galway and Cork. The name has been changed in some cases to Leonard, an English name, q.v. IF. |
| Ó Leannáin | Lennon, Lannin: an-líonmhar: Ulaidh, Oir-dheisceart, Gaillimh-Maigh Eo. Bhí clann airchinneach ag Lios Gabhail, Fear Manach agus dream eile ag Cill Ala. Bhí clann in oirthear na Gaillimhe a bhain le h-Ó Ceallaigh agus an ceathrú ceann ag Cuan Dor, i gCorca Laoidhe. Deineadh Leonard díobh, áiteanna. Athleagan: Ó Lionnáin. IF. |
| O Lionáin | rare: Dublin etc. Ir.Lang. See Linnane. |
Parishes where Lennon and a second surname are found together
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