first name vs forename

first name

noun
  • The first element of a full name in cultures that place the given name first. 

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 first name and forename occurred in a corpus of books? (source: Google Ngram Viewer )