Demonyms

Not according to Wikipedia's or our definition of demonym. A better term is ethnonym.

Let me say that I find it stupid that the word has that meaning. Are we sure it's not a mistake somehow?

I did not know the exact meaning of the word either, but it appears that it refers exclusively to place-name derivations. See the last review here.

Then maybe we should make a point of renaming it to Ethnonyms? The trouble is that there's substantial overlap and it can also be quite difficult to determine. A person can be German by origin, but have a French passport. They might have even been born in France, and have some ancestors in Germany. We might agree that there are a French people (ethnonym), but were there a Yugoslavian people? Are all people born in Russia also Russians? Native Americans in the US or Canada?

I will go ahead and create Category:Ethnonyms.

I don't think things are so complicated. In my part of the world ethnicity is the most important organizing principle and is easily definable. ռուս (ṙus) / ру́сский (rússkij) are ethnic Russians, ռուսաստանցի (ṙusastancʻi) / россия́нин (rossijánin) are citizens of Russia. Yugoslavian and American are demonyms.