Ishmaelite vs hajji

Ishmaelite

noun
  • An Arab Muslim. 

  • An outcast. 

  • Any descendant of Ishmael. 

hajji

noun
  • A Muslim or Arab. 

  • a Muslim who has participated in a hajj. 

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