He claimed to have "on purpose" given himself the title prefix HRH for His Royal Highness when making the booking.
Instead, academics would just be called by their surname and prefix such as Mr, Mrs or Ms.
A second alternative explanation is an ethnic/language confound: VanBoven works for VanDyke Associates while LeBoeuf for LeBlanc Associates because the former lives in Dutch speaking Flanders and the latter in French speaking Wallonia; Van is a common Dutch prefix, Le a French one.
