What is "corlough"

Corlough is a Roman Catholic parish situated in the Barony of Tullyhaw, County Cavan, Ireland. It derives its name from the townland of Corlough, in which the parish church is situate. It formed part of the larger parish of Templeport until 1877 when Corlough was made a separate parish. The name of Corlough parish has an unclear derivation. Some references propose it means either 'the Hill of the Lake' or "the Lake of the Herons". These are unlikely meanings as there is no lake in the townland. The earliest reference to the townland is in the 1790 list of Cavan townlands where it is spelled "Corclagh", which would be an Anglicization of "Cor Cloch", meaning either 'the Stone on the Smooth Hill' or "the Stony Hill", a more likely explanation.