This is a pretty mushy area, philosophically. Is a name what you think something is called (I think our planet is called “Bloop”, but nobody cares) what a lot of people think something is called (“Indian” in reference to indigenous Americans is a famous example of that going poorly, as are many racist epithets), or what an official body says it should be called (“Palestine”, “New Zealand”, and “Taiwan” have entered the chat)?

I don’t think popular usage is any more “truly authoritative” for a name than other sources.