What does Charisse mean?
Generally a French-styled elaboration of Greek 'charis' (grace, kindness). Some sources propose an unrelated derivation (a cherry/Latin 'ceresia' link, or a feminine of Charles), so the grace meaning is the most-cited but not undisputed.
What does Persephone mean?
Persephone is the Greek goddess of spring and the underworld; the meaning of her name is debated.