I would like to give precisions about french titles. In nobles families, only the head of family can be called X, baron de Y. The other male members of the families will be baron X de Y (and it is only a courtesy title). The head of a family de Durand would be Jean, comte de Durand, while his uncle Paul (younger brother of the late comte) would be called Paul de Durand, or by courtesy comte Paul de Durand. The biggest part of the french titles in the Bottin Mondain or in the family announcements of Le Figaro are courtesy titles.
About the Chodron de Courcel family, the head of family is Jean Chodron, baron de Courcel and not Jean, baron Chodron de Courcel.
About the Chodron de Courcel family, the head of family is Jean Chodron, baron de Courcel and not Jean, baron Chodron de Courcel.