This is a Message Board Post that is gatewayed to this mailing list. Surnames: Tennancour, Detonancour, DeTonancour Classification: Query Message Board URL: http://boards.ancestry.com/mbexec/msg/rw/INB.2ACE/1449.1 Message Board Post: There are several people in southwest Montana who spell their surname "Detonancour," or "DeTonancour." Could this alternative spelling fit your information?