Demonym

When I showed my wife the hilarity of my friend's post, we started talking about Niger, the country where they live. What is a person from Niger called? I had an idea, but I didn't want to make anything up, so I checked Wikipedia. Our friends there introduced me to one of my new favorite words: demonym. Literally, it means "name of the people." It seems a fairly recent neologism, and it's brilliant. By the way, they're "Nigeriens," pronounced with a Freedom accent.