Seller vs Slave

Seller

name
  • An English and Scottish metonymic surname for someone who worked in a cellar. 

  • An English and Scottish occupational surname for a saddler, or for a person who sells things. 

  • An English and Scottish topographic surname, derived from any of several places named Sell. 

Slave

name
  • Synonym of Sclavia 

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