What does Callista mean?
From Greek kallistos/kallistē 'most beautiful', the superlative of kalos, from kallos 'beauty'. Kalliste was a title of the goddess Artemis; the mythological nymph Kallisto bears the same root.
What does Charis mean?
From Greek 'charis' (χάρις) meaning grace, kindness, or charm. In Greek myth the Charites (Graces) were goddesses of grace and beauty; the root also underlies the word charisma.