Mr. Laser Beam wrote:
^ IIRC, William and Harry are using the last name 'Wales' for their military careers. I guess there's a reason for that, but it escapes me. Maybe because it's shortest of all the possible names they could be using?
While they were in the military (and prior to William receiving his Duchy), They follow the practice of taking a subsidiary title of their father. In youth, their names were Prince William of Wales and Prince Henry of Wales. It was simpler to remove the "of" and simply go by William Wales and Harry Wales.
This all actually kinda goes hand in hand with that thread in the Trek General forum about aliens with one vs two names... Royalty and Peerage is one of those situations on Earth where individuals don't follow conventional naming guidelines. I would think it would be weird to not have a last name.