Crick vs Cropper

Crick

name
  • A habitational surname derived from the placename 

  • A village and civil parish in Daventry district, Northamptonshire, England (OS grid ref SP5872). 

Cropper

name
  • An English surname originating as an occupation for a cropper. 

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