I'm looking for the words of Fionnghuala too. I just know about the existence of a book entitled: "Songs of the Hebrides" 3 volumes, by Kennedy-Frazer and Macleod, Boosey and Co., 1921. You can find it in Edinburgh at the Scottish School of Music Studies, University of Edinburgh, 27 George Square. Tel: 0044-131-6504160. The song comes from the Isle of Barra. If you discover anything let me know.