It will be but a commonwealth in my outer space empire

commonwealth is that a walking dead world beyond referance

No, more of just a British Empire reference, e.g., the Commonwealth of Australia. If I were to start my own country, it would have numerous colonies throughout the solar system (both on planets/moons, and artificial habitats), with the largest ones being called 'commonwealths' that are broken up into states/provinces, like Canada and Australia were to the British Empire.