How about these faction names:
- Tau Cross Armada (Space)
- The Darkspire (Fantasy)
- Xeno Shadow Forces (Space)
- Shadow Wolf (well, I keep thinking about this for a reason. Thinking about a factions war community that isn't mine (maybe includes Minecraft)) (Guild)
- R-cro Robotics Assembly (Near future)
- Aphullia Empire (Space/Fantasy)
- The Eagle United Amry (EUA) (Near Future)
- The Kingdom of Efuria (Monarch Human Medieval Kingdom (with small fantasy elements also), similar to other popular kingdoms (Lordaeron and Gondor for example)) (Fantasy)
- The Church of Highness (Holy Kingdom) (Space & Monistic)
- The New Ortanis States (Modern)
- The Carn Army (Far Moden)
I am going to use Warcraft 3, to make the factions war via conquest maps, make the group on a Hiveworkshop.
A Discord fiction geopolitical RP uses random nation names (non-Earth)
I use these musics to think of something that related to the faction battles (definitely):
- Two Steps From Hell - Victory: Thinking of the final war, dramatic battlecry, dramatic struggle to defeat the mortal enemy or the forces of evil
- Two Step From Hell - Never Back Down: Thinking of the soldiers are ready to move and attack, battlefield occurs, struggle to defeat the opponent
- Antti Martikainen - A Taste of Freedom: Thinking of futuristic battles, moving mechas, battle of freedom (just like its name)
- Frank Klepacki - Act of Instinct: Thinking of preparing troops and bases on near future factions
- Frank Klepacki - Mechanical Man: Thinking of mechanicals, machines, robots, s'uff, and scavenger army (not Cosmoteer)
- Frank Klepacki - Machines Collide: Thinking of the Rise of the Machines
- Sins of Solar Empire OST - TEC Theme: Thinking of space battle of Terran race
- Warcraft 3 OST - Comradeship: Thinking of dawn of the (fiction) civilization, the world returns to the peace state once again.
- Frank Klepacki - Hell March 2: Thinking of enemies are approaching, try to defend against them (Red Alert styled)
- Jo Blakenburg - Gryphonheart: Thinking of fantasy factions (not website) and kingdoms
- ParagonX9 - Chaoz Impact: Thinking of fighting the enemy faction with ur flying craft!
- And many more...