Clinch vs Thaw

Clinch

name
  • A river in Virginia and Tennessee, United States, a tributary of the Tennessee River, named after an 18th century explorer. 

  • A surname. 

Thaw

name
  • A river in South Wales which flows into the Bristol Channel at Aberthaw. 

  • A surname from Burmese. 

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