Oresund vs Sound

Oresund

name
  • A strait that separates Denmark and Sweden. 

Sound

name
  • The strait that separates Zealand (an island of Denmark) from Scania (part of Sweden); also sometimes called by the Danish name, Øresund. 

  • Synonym of Plymouth Sound, Devon, England. 

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