Wii-U's gpu is called Mario, and AMD named it that over 4 years ago.

[snowdog]

Going by the die shot of the Wii U's GPU there's been so much customisation that the original GPU it's based on is completely unrecognisable. There's still over a third of the silicone that's a complete mystery, and the two thirds that people have 'worked out' is complete guesswork.