Sagan vs skillion

Sagan

noun
  • A unit of measurement equal to at least four billion. 

name
  • A village in Sardasht Rural District, in the Central District of Bashagard County, Hormozgan Province, Iran. 

  • A town in southern Ethiopia, named for the river. 

  • A river in southern Ethiopia. 

  • A surname. 

skillion

noun
  • Any indefinitely large number. 

  • A room built against the back of another building, having a separate roof. 

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