Barron IN Banff Scotland

My 3rd Great Grandfather was John BARRON, in 1799 he married Margaret McCurrach in the Parish of Rathven, Banff Scotland. I have been unable to find him in any other Parish records or census. Their Descendants lived at the dwellings named Berrybaunds and Bunnach for several generations. I am looking for any suggestions on how to find out where John came from. My father immigrated to Canada in 1920 and Buffalo NY in 1923.
Carole Barron
California