brandmark vs trade name

brandmark

noun
  • The logo of a brand 

verb
  • To name or mark by branding; to give a brandmark to. 

trade name

noun
  • A name used to identify a commercial product or service; may or may not be registered as a trademark. 

  • The name under which a business or firm operates. 

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