What should I name these characters in my book?

The main character (also the narrator) is a barbie-doll looking 17 year old girl who has thick, blonde hair that reaches to her and hazel eyes. She's a good student and shy and her name has to be pretty. Her best friend is a girl who looks like an African Goddess. She's (obviously since I said African Goddess) African-American with curly black hair that goes just past her shoulders and brown eyes. She is a rebel. I was thinking Blonde: Whitney Brown: Roxanna (roxy)... But, I'm not sure. Help! Please!