He answers to Henry in the Spring 1958 wedding. In 1957, Marion calls him Sweetheart, Mutt and Henry. Indy calls him kid, son, and junior. 'Mutt Williams' was used in the credits and on merchandise. The trademark 'Mutt' was registered January 16, 'Mutt Williams' registered July 2. What name do you want to see on post-KotCS merchandise, in fiction, and possibly Indy 5?