kierie vs shillelagh

kierie

noun
  • A traditional club used as a weapon by certain indigenous groups of South Africa. 

shillelagh

noun
  • A wooden (traditionally blackthorn (sloe) wood) club ending with a large knob. 

  • Any cudgel, whether or not of Irish origin. 

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