Docking vs Firth

Docking

name
  • A village in King's Lynn and West Norfolk district, Norfolk, England (OS grid ref TF765370). 

  • A habitational surname from Old English. 

Firth

name
  • A small village in north-east Mainland, Shetland Islands council area, Scotland (OS grid ref HU4473). 

  • A village in Nebraska. 

  • A city and town in Idaho. 

  • A surname. 

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