Indeed, that's a wonderful example. It hurts Perl6 and Perl5 both that extra hoop jumping is required to find information about either one exclusive of the other. That's probably the strongest argument I can can think of for not naming two different but related languages as if they are mere version differences.

I'm not one of the anti-6 folks. I like both of them. I just wish it the naming wasn't so confusing for the search engines. Using quotes helps in SEs that understand them, though. "Perl" is still unique enough that "Perl 6" gives decent results. Searching for "Perl 5" becomes problematic though if you're looking for stuff written before the " 5" was necessary for differentiation. It's still not as bad as searching for some of these others, but it could be better.