The above song apparently is sung under several titles:

GREY LAKE OF LOUGHREA, sung by Christy Moore, Johnny Johnston, Tony Small, et al.

LADY OF LOUGHREA, sung by Colm O'Donnell, John Ennis, et al.

...but the original title was THE PRETTY GIRLS OF LOUGHREA. The original text by the poet Padraic Fallon was posted here.