endonymous

• a word derived from endonym.
  endonym

  noun

  the name that an ethnic, racial, or social group uses for itself or its language, such as Schwyzerdütsch for Swiss German.

More Suggestions

• antonymous
• endogamous
• eponymous
• pseudonymous
• endogenous
• endonym
• homonymous
• onymous
• paronymous