| de Lacy | rare: scattered. Ir. de Léis. Hugo de Lacy acquired the Kingdom of Meath at the Invasion, but the name is mainly identified with Co. Limerick. IF & SGG. |
| de Léis | Very rare: Dublin. Ir.Lang. See de Lacey, Lacy. |
| de Léis | (de) Lacey, Lacy: líonmhar: Oir-dheisceart, Lár na Tíre, tuaisceart Mumhan & rl. Tháinig muintir de Léis ón bhFrainc le Liam Concaire agus bhí Hugh de Lacy i bhfochair Strongbow i 1170. Bhain sé Cúige na Mí de Mhuintir Uí Mhaoilsheachlainn, teaghlach ríoga na Mí, agus dhein Annraoi a Dó Iarla de. Bhí clann eile ag Baile an Gharraí, Luimneach, ach tá tuairim ag Mac Giolla Iasachta gur dream difriúil iad. Ar aon chuma, bhí siad chun tosaigh ar son na h-Éireann sa 16 & 17 céad. Bhain Peadar de Léis clú mór amach in arm na Rúise sa 18 céad. IF & SGG. |
| Lacey | numerous: South East, E Leinster, N Munster etc. Ir. de Léis. Anglo-Normans in Meath (12 cent) and Limerick, perhaps two separate families; also Ir. Ó Laitheasa in Wexford. This is Ó Flaitheasa (ruler-choice) with "F" aspirated. SI, IF & SGG. |
| Lacy | Quite numerous: Midlands etc. As Lacey. Reaney states that the name is from Lassy in Normandy. DBS. |
| Leacy | Quite numerous: Wexford etc. Ir. Ó Laitheasa from Flaitheas, principality. A sept of Wexford which predates the Norman Lacey, q.v. SGG. |
| Ó Laitheasa | Lacey: líon beag: Loch Garman & rl. Ó Flaitheasa le ceart. Bhí an chlann sa i Loch Garman riamh ach, ar ndóigh, tá meascadh leis na Normannaigh, de Léis, q.v. |
Parishes where Lacey and a second surname are found together
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