Thanks very much Peter for your explanations, and many thanks also Frances and Averil for the land record refs.
In censuses the Corkills were shown farming at Booilevelt and then later at Maugher-e-Kew House, but on their gravestones John Corkill c.1796-1879 was "of the Curragh in this parish"; his eldest son Robert 1821-1896 was "of the Curragh"; and Robert's wife Mary was "...wife of Robert Corkill Curragh" [1883].
Averil, your ref to the "Parts or Parcells of the Estate of Magher e Kew...", which includes the Curragh, looks spot on.
Sue