K vs kay

K

intj

  • Synonym: 'kay 

  • OK 

character

  • The eleventh letter of the English alphabet, called kay and written in the Latin script. 

kay

noun

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

  • A kilometer. 

  • The name of the Latin-script letter K. 

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