 The Masterton surname of Tilly Masterton and Jill Masterton in the  Ian Fleming (I) (qv) novel was changed to Masterson for the film.  Tilly Mastersons alias in the movie was Tilly Soames and the T.M.  initials on her case stood for her real name. Ian Fleming (I) (qv)  is said to have based the Masterton name on Sir John Masterman, a  leading Oxford University academic and former Mi5 agent.