If I might add 2 cents of help here in clarification, with reference to the passage above
"In Lachlan MacBean's Songs & Hymns of the Scottish Highlands it's given with the original Gaelic words, "Leanabh an aigh", and the note says: "Gaelic words from the hymn by Mrs. M. MacDonald, Mull (Mairi Dhighallach, bean Neill Dhomhnullaich ann an Ard Tunna)." While there's no note about the translation, we can safely assume it's by MacBean, I think." Ard Tunna (or Ardtun as it is given on maps) is a sort of suburb of Bunessan (how anywhere that small could have suburbs beats me) on the Isle of Mull and is a very beautiful place there are some views Here, scroll down it sorta sums up the tune in some ways.