Yes, I meant British Isles. Given the interrrelatedness of English, Scottish, Irish and Welsh music, it does seem as though there should be a useful general term to cover the wider tradition. I'm going to look into the melodies for other variants and for '"Death is a Melancholy Call" to see how they relate to Jackson's.

Apparently, Holly Hundley of West Virginia recorded it as "Willie Cook" on Folksongs + Ballads, Vol. 3, Augusta Heritage (AHR 9), 1991. I haven't heard her version, but I know she generally does traditional material so maybe it isn't confined to the Ozarks after all.