Check out this site: http://www.houseofnames.com/coatofarms_details.asp?sId=&s=Chaudoin It gives these as variant surnames: Chaudenay, Chaudenet, Chaudenez, Chaudenait, Chaudenais, Chaudenays, Chaudenaits, Chaudenets, Chaudnay, Chaudnet, Chaudnez, Chaudnait, Chaudnais, Chaudnays, Chaudnaits, Chaudnets, de Chaudenay and many more. First found in Bourgogne, where the family has been seated since the early times. Some of the first settlers of this name or some of its variants were: Anthony Chattenau settled in America in 1772.