calling name vs pet name

calling name

noun
  • The name by which a person is normally identified in conversation. 

  • The name associated with the telephone number or similar identifier of a caller. 

pet name

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

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

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