Titanean vs Titanian

Titanean

adj
  • Of Titan, the largest moon of Saturn. 

  • Of the Titans, literally or figuratively. 

noun
  • An inhabitant of Titan (the Saturnian moon) 

Titanian

adj
  • Of Titan, the largest moon of Saturn. 

  • Of the Titans 

  • Of the faerie queen Titania 

  • Of Titania, the largest moon of Uranus. 

noun
  • An inhabitant of Titan (the Saturnian moon) or of Titania 

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