Scots language
However, the origins of this term are not from within Scotland, as far as I am aware. The name given to the Germanic language spoken in Scotland was originally "Inglis" at the time of Barbour. It was Gavin Douglas who coined the term, "Scottis", but there was no mention of anything - language or people - called "Scotch" until much later.
I may be wrong, but I hold the view that it is an English term for the Scots and the Scots language that Mr Pate refers to. I find it impolite when it is used by such people. If asked if I am Scotch, I say it's too early in the day for me, but they're welcome to a glass of it, if they wish, as English and Americans call whisky by that name.
"Scotch" is a music hall term and has no relevance to any people or language that I am aware of.
ANDREW HN GRAY
Craiglea Drive
Edinburgh