Garry Gillard's transcription has "laylum" instead of "leyland."

The Folk File mentions "the mysterious word 'laylum' that is sometimes found in English country folk songs" and says it may be derived from "lea-land."

The only other "laylum" I can find on the Internet is the Westshore Laylum Intermediate Care Home in British Columbia. I wonder how it got its name?

I recall reading somewhere that "laylum" is an old word that means "chorus" or "refrain"—It makes sense in the context of this song—but now I wonder if that wasn't someone's conjecture. I can't find it in any dictionary.