name day vs red letter day

name day

noun
  • The feast day of the saint after whom one is named. 

  • Synonym of ticket day 

red letter day

noun
  • A day marked in red on calendars; a church feast day. 

  • A particularly significant day; a day of personal or sectarian celebration. 

How often have the words name day and red letter day occurred in a corpus of books? (source: Google Ngram Viewer )