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On their website it says: "Go™ is officially Open Source" [1]. So maybe they trademarked it?

Yeah, we did trademark it. Trademark's are pretty narrow - computer language isn't likely to be confused with a CD tool.

I spent 5 minutes searching for the ".go" code before back-tracking to the project site[1] to verify that it was a Java/JRuby project.

Even if they started the project first, it can't take that long to add 1 line to the readme for clarity.

[1] http://www.go.cd/contribute/

Did the change. https://github.com/gocd/gocd/blob/master/README.md. Hope it helps.

Speaking of golang (go), this slide [0] lists breaking new ground in programming language research as a non-goal. That may include language name research.

[0] http://talks.golang.org/2014/research.slide#7