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There is in fact also a place called Morton in La Vienne, France.
But I noticed that the English surname Morton is usually explained as deriving from an English placename, where Mor = marsh, fen, moor, and tun = enclosure, settlement.
Nevertheless, it is also confidently asserted by some that Morton is an anglicized form of Mortain, a great baronial family founded in England by Robert, Earl of Mortaine, uterine brother of William the Conqueror.
Perhaps it has more than one origin.