DERBYSHIRE PLACE NAMES: What do they actually mean?

Ever wondered what the name Chesterfield actually means?
Chesterfield is famed for its Crooked Spire but what does the town's name actually mean?Chesterfield is famed for its Crooked Spire but what does the town's name actually mean?
Chesterfield is famed for its Crooked Spire but what does the town's name actually mean?

Or maybe how Matlock got its name?