What is the full first name of the babysitter in Calvin and Hobbes?

The full first name of the babysitter in Calvin and Hobbes is Rosalyn. Rosalyn is a character who frequently appears in the comic strip as Calvin's teenage babysitter. She is portrayed as a responsible and no-nonsense individual who often has to deal with Calvin's mischievous and imaginative antics. Despite her efforts to maintain order, Calvin often outsmarts or takes advantage of her, adding entertainment and humor to the comic strip.