Numerous North American folk tales and songs (particularly New England origin) make reference to "Old Scratch."
An hour of web searchs turned up an obscure reference to Nordic roots.
Even more than citations and references - I would appreciate the SOURCES - that reference his referral.
Sincerely,
Gargoyle
If Random House would only publish their Third Volumn of American Slang - I am SURE the origins - usages lie within Mr. Lighter's reference base.