Yeah, "golang" is the standin for when "go" is already taken (https://github.com/go). But still, the official name is "Go", and there's no good reason to not use it in the title of a blog post (other than SEO I guess)...

My site has its own search engine (just sqlite full-text search, nothing fancy) and searching for "go" is entirely unhelpful. So yes, external and internal SEO.