What an interesting idea.
The broadside ballad "Liza Wells" has possible similiar changes. The girl's surname is different in some versions. There's a line in one version that may have originally been "..he knew Liza well" but later became ..."he knew Liza Wells." Can't remember the name change off-hand but Malcolm Douglas suggested the mondgreen, I remember.
"Randal My Son" is sometimes known as "Taranty My Son" - from "Where are you going to Randy my son?"
My favourite is "Alice Benbolt" -- from "Do you remember Sweet Alice, Ben Bolt?" This incorrect title is on the website of one of the Irish groups. Forgotten which one.
Cheers, Joy