Are the X-Men films aimed at fans or a general audience? And what does it assume people know?
Well, clearly it is a general audience, with nods to fans, but it plays on what the audience knows. Or doesn't know. In this case, who the characters are? Specifically, do we know them as their human names or their X-Men names?
I watched the movies, and counted for the main cast, and here are the results of the first movie.
Logan is Logan, Rogue is Rogue, Scott can be either, but Storm is Storm. She has an actual name, you know! And Eric is more Magneto than Eric.