Dear rich,Thank you for your suggestion. A lassie is female, and a laddie is male. So, what I am looking for is not a variant of "Hieland Laddie".
I am not quite sure which title is correct, Hielan Lassie or Highland Lassie. Anyway, the song is sung as "Hielan lassie, bonnie lassie, hielan lassie, be mine..."