Stiller, Villa, Diller, Tiller, Killer?
If you were Camila Carreras or Camila Cordero you could call yourself Cee-Cee.
Windsor
Brown
Kennedy
Bennington
If you don't want use your mother's, maybe there is some other family name, like your grandmother's maiden name, that you like. Or someone who has inspired you.
Jenkins
Won't you change your last name when you get married anyways?