Are Google hit numbers a decent barometer of how widely known any given thing is, or is there a lot of error in using it that way? Certain things are greater attractors than others for being mentioned on the internet?
For example: "Dark Knight" returns approx. 9 x 10^7 hits.
Most people on Earth, hundreds of millions without access to the internet, are at least aware of Batman, even if they haven't partaken of any of the movies, comics, etc.
Even with that, that's one internet hit for every 77.7 people on Earth. For a moniker of a fictional character.
In contrast, "Rzeppa joint" returns 28,400 hits. A mechanical device that must be in hundreds of millions of automobiles on Earth.
But most people probably know them as CV joints, without caring if they're a Cardan, or whatever.
"CV boot" gets 2,950,000 hits, and only Rzeppas need boots. So search terms on closely related things can sometimes give wildly different results; one needs to be careful.