I presume "we Irish and Scotland" means "an American with somebody called Mac-something in the family tree who has never been east of Chicago".

Oswald published the tune as "To daunton me" in 1740. Stenhouse quotes a Jacobite pastiche of the words from 1750. Burns refers to the song as "To daunton me" in his letters to Johnson. There is no room at all for argument about what the words are.

It's surprising nobody from your side of the pond has brought Downton Abbey into it yet.