You're not familiar with the tradition of recursive acronyms of that kind? They are quite common (e.g. "Wine Is Not an Emulator", "Pine Is Nearly Elm", "Lame Ain't an MP3 Encoder", and so on). They are often quite descriptive as well, as in this case: GNU was intended to be just like the existing (commercial) Unix systems, to the extent that we now call POSIX-compliance, but then again, it is not Unix because Unix was a trademarked name of a proprietary closed-source system sold by AT&T, for which GNU provides an Open Source (and more importantly, a Free (with a capital letter, to distinguish it from "gratis" or "free as in beer")) alternative. The name "GNU's Not Unix" perfectly describes what is going on here.
I AM familiar with the tradition of recursive acronyms, a trend GNU probably started. Or at least, the others are probably taking after it. I think you're missing my point. It's not that the first word stands for "GNU", it's that the name makes very little effort to describe what it's about. From gnu.org:
"Names convey meanings; our choice of names determines the meaning of what we say. An inappropriate name gives people the wrong idea. ... If you call it
GNU/Linux, that conveys (though not in detail) an accurate idea."
Well no, it doesn't really convey anything, except it's this thing with "Linux" in its name as well as that it's "not Unix" and it's something called "GNU."
There's really a conflicting idiom here. When GNU wants to make a name it gets to make up something cute and only very superficially meaningful (you could say it refers to Unix I suppose, and you COULD make a point that Unix IS responsible for GNU in a direct and non-trivial way, but I'm pretty sure the name is meant to be more dismissive than crediting). When the OS we're all referring to, that contains GNU, wants to make a name it's obligated to refer to GNU.
The fact is, any total lay person won't derive any meaning from either name without doing more research, at which point they should come to the same information regardless, if they're at all sincere in their search. And while you may think the name perfectly describes what's happening, the truth is that any casual reader will have no idea about any of what you're talking about, much less how it relates to the ideals that FSF espouses.