Kallisto is a ♀ female name.
Kallisto is a name of the Greek mythology. She was a nymph, wo was loved by Zeus and was changed into a bear by Hera because of jealousy and became the Great Bear constellation. The masculine forms of the name are Callisto or Calisto.
Kallisto means “most beautiful” (from ancient Greek “kállistos/κάλλιστος” = most/very beautiful or “kalós/καλός” = beautiful).