middle name vs trademark

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. 

trademark

noun
  • The aspect for which someone or something is best known; a hallmark or typical characteristic. 

  • Any proprietary business, product or service name. 

  • A word, symbol, or phrase used to identify a particular company's product and differentiate it from other companies' products. 

adj
  • Distinctive, characteristic, signature. 

verb
  • To register something as a trademark. 

  • To so label a product. 

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