No one has ever said where the Sarah 'Clanton' was found. I believe it must be that James PEtty & James PAtty may have been confused by the person who first connected Sarah 'Clanton with being married to James PAtty. In fact, the Petty who made a Will in South Carolina is the one who married a Clanton. This can be verifed at the Petty Papers on www.pettygenealogy.com
I have not seen anything in the Virginia records so far to convince me of the maiden name of the Sarah who was the wife of James Patty. We simply do not know what her family name was before her marriage to him.
If anyone can show otherwise, you are welcome to post it here.