TheWertle has translated an interview with Nomura from Kingdom Hearts II: Final Mix+ Ultimania and realized that the names of the knights are related to elements just like in the last game.
An explanation for those not aware: The knights are the characters that made an appearance in the secret ending of Kingdom Hearts II. They are a part of the next Kingdom Hearts title.
· The frozen male knight is called Ven which means Wind.
· The female knight is called Aqua which means Water.
· The name of the second male knight, the Enigmatic Soldier, is unknown yet. His name should be related to Earth, though.