You mean like a web search engine? A quick search on "gio lib" shows a wiki for Gtk's GIO as the first result. You might narrow down the search adding domain-specific keywords to it, like "gio lib golang" to find something like this - https://github.com/vlorc/gioc (completely different field and name, but still can be found).

Having worked with GIO just yesterday I've got to say that the name GIO on it's own is not great in this modern age of the internet.

Because searching "gio menuitem" returns a lot more pizza than development docs :). Prefixing my search request with glib (which gio is a part of) solved that for me.

In that particular case a web search works, sure. But for most name clashes that I see, it's often tools that are well known in some domains but not so much in others.