Feather vs Silver

Feather

name
  • An English surname originating as an occupation. 

  • An anglicized Americanized German surname from German, equivalent to English Feather. 

Silver

name
  • An English surname originating as an occupation for a silversmith or a rich man, or for someone having silvery gray hair or living by a silvery brook. 

  • A unisex given name from English from the metal, or transferred from the surname. 

  • A surname from German. 

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