As NationStates continues to grow in depth and complexity, I'm pleased to announce the addition of the cutting-edge Conjugator Mk IX Grammar Simulator shard to our core nation-modeling engine. With support for nouns, adjectives, and plurals, grammar has never been so much fun!
So you can specify what your people are called, instead of having the game take your nation name and stick "ians" on the end. Go to your Settings page and you'll find a new Demonym text field. There's also a little "(?)" for help and extra options for those sophisticated/persnickety nations that require total control over national grammar.
This will be used in your national description on your main nation page, and in various issues when referring to your people and national assets.