It' Child ballad #76, and Child's title was "The Lass of Roch Royal". '#76' will find versions in DT (easier than looking for 'Lord Gregory', and title independent). There are 23 tunes in Bronson's 'The Traditional Tunes of the Child Ballads', but not texts for all, and he includes 'Who will shoe your pretty little foot" versions, which are only the lyric part of the ballad, and these often mixed with floating lyric verses that have no relevance to Child #76.