I understand there's some commercial outfit out there calling itself the Space Nation (which makes me mad) but why should we switch to Kingdom? Do we have monarchs? No, we are so far a direct democracy. Why not Space Republic though we are, it's true, not technically a republic but rather a democracy? At least it would reflect somewhat our governmental structure.

Space Kingdom has a sci-fi, fantasy, comic-book ring to it, but it sells this effort short.

I agree. Kings are also male, so it's really sexist! How about Space Race?