Juliet vs valentine

Juliet

name
  • A woman who is or is with a great lover. 

  • The sixth moon of the planet Uranus. 

  • One of the main characters of William Shakespeare's play Romeo and Juliet. 

  • By analogy with the Shakespearean character, a woman who is in love with a man from a family, party, or country opposing that of her own. 

  • A female given name from Latin. 

valentine

noun
  • An expression of affection, especially romantic affection, usually in the form of greeting card, gift, or message given the object of one's affection, especially on February 14th. 

  • A person to whom a valentine is given or from whom it is received, especially on February 14th. 

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