Hello, I suppose you know that de Guise is was the family name of Mary Queen of Scots' mother. Her family were all French and because of this she was considered as, and became the wife, at the age of 7, to the old King of France, Louis, I can't remember which one. After his death she returned to England and was married off to Robert Darnley and then married Bothwell, the rest, as they say is history. I hope this helps, not sure if it does. The name is definately French.