Lay vs Main

Lay

name

  • A river in western France. 

  • A surname. 

Main

name

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

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

  • A surname. 

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