Surprisingly little. Though for a small time the Go releases were almost the same version numbers as GoJS so I'd have a mini heart attack when go-lang made HN frontpage.
I used to think gevent was a Google made library about event handling. Turn out the g stands for greenlet.
I agree gojs is confusing as it seems to be "go-lang implementation in javascript" but I believe no one can claim the ownership over the word "go", as it's an normal English word as well...
(for us, Go stands for Graph Object)