middle name vs nickname

middle name

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

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

  • One's mother's maiden name. 

nickname

noun
  • A familiar, shortened or diminutive name for a person or thing. 

  • A familiar, invented name for a person or thing used instead of the actual name of the person or thing, often based on some noteworthy characteristic. 

verb
  • To give a nickname to (a person or thing). 

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