What is a pretty Japanese name for a girl and a cute nickname, too?

First and last, please. And if you can, could you please come up with a cute nickname that suits her? --> She is a child prodigy (Music), but the story centers around her as a fifteen year old. She has wavy/tousled dirty blonde hair that stops at the small of her back and big, brown eyes. She is sarcastic, stubborn, and has a boho-type of style. Thank you!