Moor vs Sky

Moor

name
  • An English surname transferred from the given name. 

  • A surname from Irish. 

noun
  • A member of an Islamic people of Arab or Berber origin ruling Spain and parts of North Africa from the 8th to the 15th centuries. 

  • A member of an ancient Berber people from Mauretania. 

  • A person of an ethnic group speaking the Hassaniya language, mainly inhabiting Western Sahara, Mauritania, and parts of neighbouring countries (Morocco, Mali, Senegal etc.). 

Sky

name
  • A unisex given name from English. 

  • A surname. 

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