When I rebind a key to the Super key in the controls menu, it gets called "Win". I don't see any reason for this, and more likely than not it will confuse people.
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I use a Mac and it's sort of sad to say Minecraft isn't meant for macs. I think it's confused and thinks the command key is the windows key.
fyi: you can set your "Full name" to literally everything, it doesn't need to be your real name, you can also just use your regular nickname.