Looking for Kerr Family of Scotland and Argentina

I am trying to trace the family of my grandfather, Frederick Kerr. He was married to Magdalene Kerr, nee Wotton. He joined Stewarts & Lloyds, was sent to Salamance University prior to his posting to Argentina.
I am lead to believe his father was a Presbyterian Minister in Scotland, possibly in the border country, but not sure.
Any help would be appreciated.