Chesterfield is definitely England. Just south of Sheffield, Yorkshire but in Derbyshire. I have family who live on a farm just 12 miles outside Sheffield, so I visit there whenever I get over there. I'm close to Vancouver, Canada.
I'm sure you can look up de in Norman Names, I think the Sherrif of Nottingham had a de....name. Might be of, I will ask a 'gene' friend who lives in Quebec, she speaks French & English.