Casper vs Gosper

Casper

noun
  • A white person. 

name
  • A city, the county seat of Natrona County, Wyoming, United States 

  • A male given name from Old Persian, of occasional usage, variant of Caspar. 

  • A mountain in Wyoming 

Gosper

name
  • A surname. 

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