I'd argue that your stance is not apples-to-apples.
How many Xbox games / peripherals had "Xbox" in their names? How many PlayStation games / peripherals had "PlayStation" in their names?
Meanwhile, let's play "one of these things is not like the other":
Wii Chess
Wii Fit
Wii Fit Plus
Wiimote
Wii Motion Plus
Wii Music
Wii Party
Wii Play
Wii Play Motion
Wii Sports
Wii Sports Resort
Wii U
That's in addition to the stacks of other games with "Wii" in the title somewhere (like Mario Kart Wii or New Super Mario Bros. Wii).
If you're marketing a console that's visually a dead ringer for a Wii, a logo that looks exactly like the Wii's (the "U" looks like a power button icon or something), a bunch of Wiimotes, and what looks like a tablet peripheral for a console that had already seen 8,000 different peripherals, the confusion is pretty understandable. Nintendo's underfunded marketing campaign barely announced that the console even existed.
The Wii name had lost a lot of its value by 2012. Nintendo had all but abandoned the Wii for its last couple of years...even worse, without a killer slate of Wii U launch software to show for it too. It was hard to read a gaming message board post, gaming site, or game-centric blog without seeing "time to dust off your Wii" every time a major new title would be announced. The Wii was a colossal seller by any standard, but it didn't have a lot of momentum going into the next generation.