Jane vs Joanna

Jane

name

  • A female given name from French, the standard feminine form of John since the 17th century. 

  • A surname originating as a patronymic derived from a Middle English variant of John. 

noun

  • used as a placeholder name for any woman, especially a young working-class woman 

  • A girlfriend. 

Joanna

name

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

  • One of the women following Jesus. 

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