apothegm vs middle name

apothegm

noun
  • A short, witty, instructive saying; an aphorism or maxim. 

middle name

noun
  • A trait, activity, or action closely associated with or aptly describing a person. 

  • A name between the first given name and the family name or surname; a second or subsequent given name. 

  • One's mother's maiden name. 

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