Line vs Mainland

Line

name
  • An English and Scottish surname. 

Mainland

name
  • A historical region in British Columbia, British North America, British Empire 

  • The largest island in the Orkney Islands council area, to the north of Scotland. 

  • The largest island in the Shetland Islands council area, to the north of both Orkney and Scotland. 

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