Irk vs Wear

Irk

name
  • A river in Greater Manchester, England, which joins the River Irwell in Manchester city centre. 

Wear

name
  • A river in the counties of County Durham and Tyne and Wear, north east England. The cities of Durham and Sunderland are situated upon its banks. 

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