persona non grata vs unperson

persona non grata

noun
  • A person who is not welcome, especially a diplomat in a foreign country. 

unperson

noun
  • A human who has been stripped of rights, identity or humanity. 

verb
  • To strip (a human being) of rights, identity or humanity. 

How often have the words persona non grata and unperson occurred in a corpus of books? (source: Google Ngram Viewer )