Gael vs Irishman

Gael

noun
  • A member of an ethnic group in Ireland, Scotland and the Isle of Man, whose language is one that is Gaelic. 

name
  • An unknown-gender given name. 

Irishman

noun
  • A man from Ireland. 

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