Drusilla was the name of the Roman Emperor Caligula's sister. Caligula was the nutter who made his horse Incitatus a senator, had sex with his sisters and waged war with Neptune (according to Robert Graves). He also killed a lot of people. Poor Drusilla had sex with her crazy brother and when she conceived, he ripped the baby out of her womb and ate it.
Still want to call your child Drusilla?
MrsT - Cilla or Silla would be a short form of it.