Demonym
Some peoples, mainly cultures that were taken over by European colonists, have no demonym. They may also have a demonym that is the same as the name of their nation. Examples include Iroquois, Aztec, Māori, and Czech. Often, the native languages of these people have forms that did not get used in English. In Czech, for example, the language is Čeština, the nation is Česko or Česká republika, and the people are Češi.