Barrack vs Jock

Barrack

name

  • A male given name. 

  • A surname. 

Jock

name

  • A given name. 

  • A nickname. 

  • A surname. 

noun

  • A Scot. 

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