Multiplicity Meditation from Jules Feiffer, 1961. Note the use of the name "Sybil," for the woman. However, Sybil the book and movie didn't happen until the early 1970's. The Three Faces of Eve, however, was out by the late 1950's.

See Your Symphony of Selves. https://www.amazon.com/Your-Symphony-Selves-Discover-Understand/dp/1644110261.