|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.|
|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.|
|Leavy||numerous: Midlands etc. Ir. Mac Con Shléibhe (hound of the mountain). They were a sept of Longford related to the O'Farrells. SI.|
Parishes where Leesy and a second surname are found together
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