The Ubisoft game's weird spelling also is a throwback to the first Ubisoft game.
ZombiU was shown off before we even knew what the name of it was, game director Florent Sacré revealed to us, as the game was the zombie game featured in Nintendo's Pre E3 Nintendo Direct.
The genesis of that began one or two months ago when Ubisoft showed the game to Nintendo. Shortly before E3, Nintendo contacted Ubisoft about including the game in the presentation.
Furthermore, ZombiU's transformation from Killer Freaks occurred when Ubisoft saw the specifics of the Wii U GamePad, and thought a zombie survival game would be more fun with the controls and inputs. The name comes from Ubisoft's first-ever game, which was called Zombi.