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You're right to question it. Redfield is an alteration of Redfin (at least in the US) as you can see at http://surnames.behindthename.com/bb/view.php?id=3799080&board=sur. In other cases, the origin might be the placename Redfield in Bristol (see http://en.wikipedia.org/wiki/Redfield,_Bristol) and that's nowhere near Scotland.