This discussion hasn't held up in the last 15 years - Why end it now?
I don't quite consider names to be part of languages; otherwise, in what language would "Linux" actually be a word? English? French? Finnish? All languages?
In all languages in which it is used as a word, of course. Do we want to get all Wittgenstein on this one? If we go by the early Wittgenstein (Tractatus), language really is nothing
but names - that is, words that denote things - and words that describe the relations between those things. Everything else is nonsense. Later Wittgenstein (Philosophical Investigations-era) would say that any word/sign that is used as a word in a language, is a word in that language, in the respect in which it is used. Which means that a word might be a proper name - say "Hoover", for instance" - but if that name suddenly starts to get used as a noun denoting a general class of things, say vacuum cleaners, then it is indeed also a noun. What matters is that all, or at least most, of the people that speaks the language agree on how that particular word/sign might be used in that context.
It is interesting to note that the young Wittgenstein was all normative - He was on a mission to tell the world how proper language ought to be used - whilst the later Wittgenstein is more or less descriptive - that is, describes how language is used in he real world - and argues the point that that, really, is the only way to pin down language.
But why not back to this one:
Are you really still discussing this?
Because we're not, really. It is not discussion - It is evangelization. To some people, this is not a matter of opinion, that is: something that can be discussed. It is a matter of fact, and the reason the world does not agree is that the world is simply not aware of the facts. Sometimes soft-spoken people arrive outside my door, and they want to
inform me of the facts that the end is nigh, that Jesus returned in 1914 and that fortunately for me, it is still not too late to get a proper understanding of the world and the facts in it. Sometimes less soft-spoken people arrive on my computer screen to inform me that the Gnu arrived in 1985 and that the end of free computing is nigh. That is why we have three or four attempts, in this very thread, to enlighten us to the legend of the 15% (the last one with pie charts, even), since the only possible reason we do not already agree is that we must somehow have missed the first two-three retellings.
In religion, this is called zealotry or a cult - The unshakable belief that everybody else is wrong. Not holding other opinions about things, but provably factually wrong about reality. And that is always a bad thing. No matter if it appears in religion, in politics or in computing, it always leads to Bad Stuff. So far we haven't had any mass purges in the FOSS movements, thankfully. But it is interesting to think about how organisations like Church of Scientology or the Plymouth brothers installs special web browsers on members computers that makes sure they won't see any "disturbing" web pages, and compare it to
http://www.gnu.org/software/gnuzilla/ <= that thing.