Jeanne Dureau - Delamare both her Birthplace & her mother in law's surname?

Did you look for la MARE" de "means from. I think la Mare is in Normandy FR.

Good idea, Barbara I'll go and look....
I see a modern place called la Mare, but can't find a history for it.

In Wikipedia this on the surname:
The De La Mare surname from French Normandy was progressively anglicized in England as De La More, More, and Moore after its bearers accompanied and assisted William the Conqueror in his conquest of England, eventually settling in Benenden, Kent County for several centuries, before many moved to America, including Reverend John Moore of Newtown, Long Island. The De La Mare's of Normandy trace their heritage to vikings and the coastal city of Møre og Romsdal in Norway. The Møre surname is a place name derived from the Old Norse "Moerr", and the Norwegian word "Marr", meaning ocean, sea, or coastal district. Rollo, the famous viking and founder of the Dukes of Normandy, which includes the present day Royal family of England, was a member of this family, his father being Rognvald Eysteinsson, Earl of Møre, Norway.http://en.wikipedia.org/wiki/Moore_(surname)