e vs kay

e

noun

  • The name of the Latin-script letter E/e. 

character

  • The fifth letter of the English alphabet, called e and written in the Latin script. 

kay

noun

  • The name of the Latin-script letter K. 

  • A thousand of some unit (from kilo-). 

  • A kilometer. 

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