Spear vs Trench

Spear

name

  • An English surname. 

Trench

name

  • A habitational surname. 

  • A suburb of Telford, Telford and Wrekin borough, Shropshire, England (OS grid ref SJ6912). 

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