I love the name Callie, its an adorable name and i think it would with a little girl?

My sister's nickname is Callie. her full name is Caroline, but we've always called her Callie. I think it's a great nickname, and i think it would be an okay first name. i tend to prefer to use it as a nickname so that a child has the option of a more professional sounding name as an adult. though everyone (friends and family) call my sister by her nickname Callie, she uses her full name professionally, (she's a nurse).