Main vs Tarn

Main

name
  • A river in southern Germany, flowing from Bavaria to the Rhine. 

  • A river in Northern Ireland, flowing into Lough Neagh. 

  • A surname. 

Tarn

name
  • A river in southwestern France. 

  • A department of Occitanie, France; previously in Midi-Pyrénées (INSEE code 81). 

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