This one has come up quite a bit in the past, so it's probably not a good idea to post the lyrics yet again!   Tony Burns gave a link to the MacPeake version on the DT; here is a link to a recent discussion:  Help: real origin of Wild Mountain Thyme  and here is a link to a list of links to previous discussions, and related lyrics on the Database:  Lyr Add: Wild Mountain Thyme--Variation.

Malcolm