given name vs pet name

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. 

pet name

noun
  • Used other than figuratively or idiomatically: see pet, name. 

  • A nickname, especially a name used by those in love with one another. 

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