I did know what jingoism is, but only barely, and mostly from history lessons and didn't think about it at all looking at the OS name.

I agree that is still used, but arguably in very specialized contexts, and has many better and less idiomatic alternatives that make it a poor choice in many publication, helping it become rarer.

I expect a lot of concept names not directly bound to the concept itself to slowly disappear, the same way calling dinnerware "china" won't stand for a lot more generations I think.

I think it could very much find its place repurposed within a capitalist context to describe the behaviour of big tech companies.

Obviously "pretty common" is, just like "obscure", completely subjective. I consider it obscure, but all I can say from looking it up is that at least according to Google Ngram, it's about 1/10 as common as "patriotism", which is saying something as that's been a declining word for a century. It's less common than "chauvinism", "sectarianism" and "xenophobia". In fact, tripling the popularity of "jingoism" still wouldn't make it as popular as any of those. It also peaked in the early 1900s and has since been on a low plateu, which again, I consider a marker of obscurity.

To me the fact that Ngram shows the word “patriotism” on the decline throws doubt on using it for any measure like this. Within the US “patriotism” is used very commonly. It leads me to wonder whether Ngram leans too heavily on scientific or academic literature and not on the words that people actually use in everyday conversation.

Does Ngram scan social media, TV or (to a lesser extent) newspapers? If not I’m dubious about the utility here.

Unless there's a Google Ngram distinct from the Google Books Ngram Viewer https://books.google.com/ngrams/ , their statistics are entirely based on material available in Google Books, which might include some newspapers, but probably not social media or TV.

You can’t open an issue of The Economist without seeing Trump or some dictator being accused of jingoism.

And how common is it to be a reader of The Economist?

Extremely common, it’s the standard magazine for economics and politics.

Maybe, but it's not "extremely common" to read any high-brow publications on politics and economics.

Well, it’s used frequently in counties that used to be part of the British Empire it appears. Australians use it all the time.

I'm a Brit, pushing 40. I'm educated to degree level (1st class, FWIW), and very well read (including the venerable Pratchett, though I don't think I have read Jingo yet).

I think I heard the word "jingoism" for the first time ever around 5 years ago. It is not a word one hears very often, and it certainly didn't come to mind from "JingOS".

If you often read high-brow political publications you may come across "jingoism" on the daily, but that is obviously not a huge cross-section of the public.

TBH, kind of bizarre how strongly this jingoism thing is being pushed in this thread.

I have used English as my daily working language in software development for over 20 years and had never heard it before.

Well, we don't discuss a lot of politics in international teams, that's a taboo topic especially when working with Chinese colleagues. And for Trump we have only one word, that I don't want to repeat here.

The English needed to discuss software is pretty limited.