Guy Gardener wrote:
No 18, hell no 16 year old from the modern world not to consider some distant alien world of super science is going to call herself "girl" unless she's trying to be sarcastic like the Legion does, hells, for any female to willing refer to themselves as a girl rather than a woman they'd have to be 12 or younger.
Superman didn't name himself (in most, if not all, incarnations of the character). I doubt Supergirl would have much of a choice. The public will call her what they want. Besides, I think she's usually supposed to be about 16 in the comics.
I wouldn't mind them making it a running joke, though. "Look. It's Supergirl!" "I'm Superwoman!"