Whateverville vs back o' Bourke

Whateverville

name

  • A substitute placename for an inhabited place, a city or town, with an unknown or unspecified name. 

back o' Bourke

adv

  • At or to an extremely remote place. 

name

  • An extremely remote place. 

How often have the words Whateverville and back o' Bourke occurred in a corpus of books? (source: Google Ngram Viewer )