Southerner vs southron

Southerner

noun
  • A resident of the American South, often specifically a white resident of the American South. 

  • Synonym of Confederate: a citizen of the Confederate States of America. 

southron

noun
  • Synonym of Lowlander: a Scottish person from the low lands south of the Highlands. 

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