Ishmael vs castaway

Ishmael

name
  • An outcast. 

  • The eldest son of Abraham and his wife's handmaiden Hagar who were cast out after the birth of Isaac; traditionally the ancestor of the Arabs via the Ishmaelites. 

  • A male given name from Hebrew. 

castaway

noun
  • A discarded person or thing. 

  • An outcast; someone cast out of a group or society. 

  • A shipwrecked sailor. 

adj
  • Cast adrift or ashore; marooned. 

  • Shipwrecked. 

  • Cast out; rejected or excluded from a group. 

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