Here are a couple of sites.
http://sohier.free.fr/menugb.htmhttp://www.demarests.com/I'm 12th generation from David and Marie and found these sites of great value. The Demarest site hasn't really been updated since 2004, but the info that's there is good. The head of the site has been doing research.
According to the Sohier site, Maries decendants are part of the Sohier de Vermandois. The Sohier family did a lot of work...Enjoy