you mean like custom name? well if you want to use w.e the actors name is get a custom message system and then using the command for name will display the name of the main hero...so you don't have to type BOB every time in a message event if your guys name is bob you just need to have the name tag.
as for choosing a name, that's going to have to be done by a script if you want a custom name, if you want a selection of names pre-made you can do that with events using the options commands.