The Water is Wide/ Waly, Waly/ Lord Jamie Douglas - but be careful - read about it here. Also search the discussions here using the forum search.

Turkey in the Straw - read about it here.

Also check out what Lesley (the Contemplator) has to say about various Child Ballads here. Many of them have numerous variants, some American, ie Billy Boy/ Lord Rendal. Jean Ritchie has a couple of tapes, Child Ballads in the Appalachians.