If I were you I'd consider:
What kind of organisation has the resources and interest to serve as "space police"? Whose laws does that enforce? Is there one giant civilization big enough to govern everyone else or is it some kind of alliance of multiple civilizations to try to keep peace.
If there really is a supreme thing then it must take pride in it's own culture as they enforce their laws and sense of justice over everyone else. That would mean the name would also reflect on that and would most certainly not be anything in English unless the supreme civilization of the universe is UK or US. The name would mean something in the supreme civilization's language and link to their culture.
If it's an alliance of multiple civilizations then it should still have a common language/culture somewhat determined by the civilization with strongest influence formed via the lingua franca principle. And the name would probably mean something in that language.
If you think about Earth, we don't even have such a thing as "Earth police" who would keep things in order here. Instead we have military forces of different countries that are at war over who governs what. Based on that I somehow find the idea of "space police" hard to believe and little naive.
You could do well by mapping what we have on Earth to the galaxy/universe scale. You have your alliances, you have your independent civilizations, the rebel and reckless, the peaceful and reclusive ones etc... Many respected sci-fi series (Star-Trek, Stargate etc) dealing with this scale of worlds have done something like this.