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origin
From an unidentiified source:
Although Sir Iain Moncreiffe of that Ilk, perhaps the greatest herald genealogist, believed that his family were of Celtic origin and descended from a younger son of the Lamonts, the generally accepted view is that they descended from a French family called de Leon, who came north with Edgar, son of Malcolm II, at the end of the eleventh century to fight against his uncle, Donald Bane, the usurper of the throne. Edgar was triumphant, and de Leon received lands in Perthshire which were later called Glen Lyon. Roger de Leonne witnessed a charter of Edgar to the Abbey at Dunfermline in 1105.
==other versions of this surname==