More published sources for Úna Bhán:

Thomas Kinsella translation (7 verses) in A. Norman Jeffares, ed. "Irish Love Poems", Dublin: O'Brien Press; Boulder, Colorado: Irish American Book Co., 1997

11+ verses in Irish with English translation and pages of background info. in both Irish and English in Douglas Hyde, "Love Songs of Connacht", Shannon: Irish University Press, 1969 (first edition, 1893)
Hyde writes of his collecting the song and stories about it in County Roscommon.