Anjouan vs Joanna

Anjouan

name

  • An island in the Comoros 

adj

  • From Anjou. 

noun

  • Someone from Anjou. 

Joanna

name

  • A female given name from Latin [in turn from Hebrew]. 

  • One of the women following Jesus. 

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