catchword vs middle name

catchword

noun
  • A word or expression repeated until it becomes representative of a party, school, business, or point of view. 

  • The last word of a speech, serving as a cue for the next speaker. 

  • A word under the right-hand side of the last line on a book page that repeats the first word on the following page. 

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 catchword and middle name occurred in a corpus of books? (source: Google Ngram Viewer )