endonymic

• 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

• endonym
• metronymic
• acronymic
• endoergic
• endolymph
• endorheic
• synonymic
• endocentric
• endogenetic