Christian name vs given name

Christian name

noun
  • A first name formally given to a child at a Christian baptism. 

  • An English given name, particularly for ethnic Chinese who usually have a separate Chinese name. 

  • Any forename. 

given name

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

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

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