Leo vs Leonian

Leo

noun
  • Someone with a Leo star sign 

  • A Leonberger 

name
  • The zodiac sign for the Lion, ruled by the Sun and covering July 23 - August 22 (tropical astrology) or August 16 - September 15 (sidereal astrology). 

  • A constellation of the zodiac, shaped approximately like a lion and containing the bright star Regulus. 

  • A male given name from Latin, borne by numerous saints and 13 popes. 

  • A surname. 

Leonian

noun
  • Someone with the Leo star sign. 

adj
  • Of, or pertaining to, the Leo star sign. 

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