I checked lodestone for the availability of the name "Arturia Pendragon" and saw that the name was not taken on Tonberry server
HTML Code:
http://na.finalfantasyxiv.com/lodestone/character/?q=pendragon&worldname=Tonberry&classjob=&race_tribe=&order=
so i bought a character renaming service and tried changing my name into that but it said that the name was unavailable.