I really like
Charlie on a boy, but I've never been particularly Keen on boy nicknames on girls.
Charlotte is best as it's long form imo. But I prefer
Lottie to
Charlie.
Please rate my "Names I would Use" list & "Backup Favorites" list. Feel free to rate some of my other lists too if you have the time.
https://www.behindthename.com/pnl/223226/138473