Sillabub is a portmanteau of "Silly" and "Bealzabub". She is the alternative to "Jemima", which was felt to have a derogoratory racial context in America, despite its biblical origins.
Sillabub featured on Broadway, Germany, most of the international productions, but not London, video or UK tours. While Jemima has satin gloves, Sillabub has fluffy warmers; Jemima tends to a dark red, but Sillabub is often more golden. Sillabub in the 2002 Berlin production looked almost identical to a London Jemima, except for her small armwarmers, but she was named Sillabub.