Idk i think it would be really cool if countries like Russia or France get called something like French Republic, or Russian Federation when a republic, (probably revolutionary) Ofc this doesnt have to apply to all countries. Great Britain would become United Kingdom, Commonwealth could probably stay the same. I feel like Revolutionary Ottomans could change their name to like Asia cause they wouldnt be based around the Osmanoglu dynasty. This doesnt have to apply to every country, just ones that would make sense.