Talk:Masked Lumen/@comment-25110963-20140801123511/@comment-1661895-20140803170456

There's no reason as to why the Sage can't learn it through the course of the story. When he first appears, Loki only ever refers to Bayonetta as 'that witch' which probably informs the Sage that he is on her tail. And since he doesn't say that line of "...or shall I call you Bayonetta?" in that meeting, he'll probably find out later on in the game.

He could either hear it from Loki, Bayonetta herself, Luka, any number of people. Even from the angels as they seem to know who she is given her 'fame' as the Left Eye.