Armitage vs Bourke

Armitage

name
  • An English habitational surname. 

  • A village in Lichfield district, Staffordshire, England (OS grid ref SK0816). 

Bourke

name
  • A topographical surname from Anglo-Norman for someone who lived in a fortified place. 

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