Reggie: "We think deeply about our product names"

[AnthonyW86]

So now we know where the name Wii-U came from!:

Iwata: We need a name for the Wii successor.
Reggie: Thinks deeply and says; Wii uuuhhh....
Iwata: That's it! Wii uh!

Iwata then wrights it down but misspels it and forgets the h, writing down Wii-U instead.