I don't know if this tip would be helpful, but when I was writing my own histories, the names are one of the most difficult things to do, so I took examples real life names, for example I created a fictional country named Jerssana, and the adjetive is Jerssen, so I can use Jerssen Army, Jerssen Union, Jerssen Commonwealth, Gulf of Jerssana, Jerssen Sea, etc. Also there is not a rule on names, but I recommend to make an easy and short remember name, because imagine your characters saying a long name, I'm a comic maker, so each word count, and I'm very careful with the words in each panel. So... In my personal opinion I like the first one.
I see you updated the list, and what do you think about Star Knight Force?