@PickAChew I have a bit of a soft spot for Ferryhill.
The page below would have you believe all sorts of things about how it got its name. Someone in the Eng Lang Department in Durham in the 70s thought it derived from something Anglo-Saxon, and had to do with fairies.
Here's my theory:
Anyone who has driven past Ferryhill on the A167 knows that it passes through a great huge cutting, which is a relatively recent road improvement in the grand scheme of things.. Ferryhill is on a hill, and in its heyday, the A167 was actually The Great North Road, the main east-coast coach route. So I reckon that what used to happen was that the stage-coaches stopped just short of Ferryhill, the passengers got off, the coach then had minimum load and could make it over the hill. Meanwhile the passengers and their luggage were conveyed over the hill by mule to the other side, where they rejoined the coach. Hopefully spending a bob or two on the way! They were ferried over the hill 
At least it wasn't far to Durham, if you were heading Northwards, where many excellent hostelries were (and still are) available
Darlington similar, for those heading South
With the coming of the Railway in the mid 1800's. the importance of the GN Rd diminished. But Ferryhill thrived, because it was near the railway. Ferryhill Station came into being, and was the freight terminal for that part of Co,Durham.
As a CAB adviser in the late 1990s, I did an advice session in Ferryhill once a week. Lovely people, left behind after the Industrial Revolution had stripped Co Durham of its mineral resources, doing their best in difficult circumstances.
https://ferryhill.gov.uk/history/#:~:text=Another%20story%20is%20that%20Ferryhill,Swan%20House%20on%20the%20east.