Christian name vs forename

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. 

forename

noun
  • A name that precedes the surname. 

verb
  • Synonym of prenominate 

  • To assign (someone) a first name. 

  • To appoint in advance. 

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