The name of the language is Go, not Golang. This is a collection of tools and libraries for Go that Facebook has developed. I don't see any compiler, though one of them wraps the Go tool that is used to compile Go programs.
Well, I think the primary difference is that I'm a little more familiar with Go, so I have slightly more context. Most of these say things like "Package that provides such-and-such functions" or "Library for doing this thing".
I don't see that it is the colloquial name of the language even if people sometimes search for it. In conversation, AFAIK it tends to be called Go. For example, look through the golang-nuts mailing list and count how many people say "Go" versus "Golang" when not referring to the website or mailing list.
Have you tried debugging something and search for for "go" rather than "golang"? You're both correct here: the name of the language is Go, and when searching google for help with an error or something, it's best to search for golang rather than go, or you'll be wading through a bunch of unrelated pages.