Aether vs Aura

Aether

name
  • One of the Greek primordial deities who was the personification of light, brother-husband of Hemera and grandson of Chaos. 

Aura

name
  • A minor female deity. See Aura (mythology). 

  • A female given name from Latin shortened from Aurelia. 

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