A midland county of England bounded by South Yorkshire, West Yorkshire, Greater Manchester, Leicestershire, Nottinghamshire, Staffordshire and Cheshire.
"The rolling hills of Derbyshire stretch across the Midland region, bordered on all sides by counties including South Yorkshire and Nottinghamshire."
The name derives from the old town of Derby combined with the suffix "-shire," which was used in Late Old English and carried into Middle English as Derbyschire. This formation simply identifies the shire associated with that specific settlement, much like many other county names today.