Sir vs seigneur

Sir

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

seigneur

noun
  • The hereditary feudal ruler of Sark. 

  • A feudal lord or noble in French contexts. 

  • A landowner in Canada; the holder of a seigneurie. 

  • A hereditary title in the Bailiwick of Jersey. 

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