given name vs nom de plume

given name

noun
  • Used other than figuratively or idiomatically: see given, name. A person's name. 

  • A first name, a name chosen for a child, usually by the child's parents; a forename. 

nom de plume

noun
  • A pen name or pseudonym. 

How often have the words given name and nom de plume occurred in a corpus of books? (source: Google Ngram Viewer )