Christian name vs prename

Christian name

noun
  • Any forename. 

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

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

prename

noun
  • A first name, a forename 

verb
  • To provide with a first name. 

  • To name in advance. 

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