Sir vs sultana

Sir

noun
  • The titular prefix given to a knight or baronet. 

sultana

noun
  • A wife or mistress of a sultan. 

  • A female ruler of a sultanate. 

  • An old form of necklace. 

  • A pale yellow raisin made from a seedless grape. 

  • A type of viol, a cither viol. 

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