Thing vs cognomen

Thing

noun
  • Nickname or appellative for numerous "things", including fictional characters. 

  • A public assembly or judicial council in a Germanic country. 

  • Nickname for the Volkswagen 181. 

cognomen

noun
  • The third part of the name of a citizen of Ancient Rome. 

  • A nickname or epithet by which someone is identified. 

  • Surname. 

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