[quote=@Dinh AaronMk]
<Snipped quote by Willy Vereb>

Versus calling it something long, convoluted, and trite within the genre like the "Holy Republican Consortium of Terra-Earth"? No, I don't think so.

I see it no different than the Avars calling themselves the Avars because they're all Avars. It's a self-given identity among a people who are not totally aware of the entire breadth of the galaxy, but know it's larger than they assumed given the Precursors.

It's not to say they refer to themselves as such on a regular basis and would most likely refer to other synonyms, Earth, or Sol. But that's just as bad.
[/quote]Um, you don't make much sense here. Avars is a national identity and they certainly didn't just call their empire as that.
People leaving in England may call themselves British but their nation is called United Kingdom of Great Britain and Northern Ireland.
People may commonly refer to you as "Humanity" but that's not what your civilization should be officially called but something along the lines of "The Star Republic of Sol and Alpha Centaury" or something.
You may try to invent an abbreviated version and don't even care about the long and convoluted name which is the truly official form.
But that's still not "Humanity".