heya! Calluna is the name of the player character. Her name doesn't come up at first because the pc is supposed to be generic. When you give her a name (in this case, Calluna), she is no longer a generic protagonist, and instead becomes her own character. So yeah, the act of naming in this game is treated as discovering/evoking one's identity or individuality, which is why she was able to reclaim her character :^)