Her name was Selena for a short time, but there were legal problems with it. Guess the book writer didn't get the info.
As a nod to this, i've nicknamed her Selenia Night-Mare (in reference to both her French Name as Nightmare Moon (La Jument SÉLÉNIAque) and her concept name Selena/ Night Mare)
Selena & Celestia, I see what you did there, very nice job. Beautiful~