 There are several references to Shakespeares "The Twelfth Night,"  on which the movie is based. The school is called Illyria, which is  the name of the country where the play takes place. Duke Orsinos  character is based on Orsino, a duke. Dukes friends are named Toby  and Andrew; in the play, Toby is Olivias uncle and Andrew is one of  her suitors. However, in the play, Viola is not impersonating her  brother in particular, just a man, and she calls herself Cesario,  which is the name of the restaurant seen where Sebastian/Viola  breaks up with Monique and where Duke, Olivia, Eunice, and  Sebastian/Viola briefly double date.