Name meanings need to be decoded to names?

i am writing a novel and i need the names of my characters to be based on there personalities. one character is 17 years old and is female and her best quality is beauty. she uses that to her advantage a lot, because its the only thing she knows. another set of characters is twins, brother and sister, so names that match for the twins would be nice, and the youngest sister nine years old amd is very mature but everyone treats her like a child.

so i need a name that stands for beauty

i need a pair of names that match, one female, one male

i need a name thats stands for rational and matureName meanings need to be decoded to names?
A name for beauty is Kalia (from Greek kalos)

lancome