endoynym vs eponym

endoynym

noun
  • A name used by a group for themselves or their location. 

eponym

noun
  • A real or fictitious person's name that has given rise to the name of a particular item. 

  • A word formed from a real or fictive person’s name. 

  • A word formed from a real or fictive place or thing. 

How often have the words endoynym and eponym occurred in a corpus of books? (source: Google Ngram Viewer )