Burke vs de Burgh

Burke

name
  • A topographical surname from Anglo-Norman for someone who lived in a fortified place. 

  • Any of various places in the United States, including 

  • A small city, the county seat of Gregory County, South Dakota. 

de Burgh

name
  • A topographical surname from Anglo-Norman for someone who lived in a fortified place. 

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