How many English counties have a cheese named in their honour?

Lancashire cheese, for one.

https://en.wikipedia.org/wiki/Lancashire_cheese

And Cheshire cheese.

https://en.wikipedia.org/wiki/Cheshire_cheese

And then there are Derby cheese, Double Gloucester cheese and Red Leicester cheese.

https://www.thecourtyarddairy.co.uk/blog/cheese-musings-and-tips/traditional-british-territorial-cheeses-their-characteristics/

Cheddar is the name of a large English village.

https://en.wikipedia.org/wiki/Cheddar

There's also the lesser known (but restricted production area) Single Gloucester. However, these town named cheeses could be from the county or the town/city. Lancashire and Cheshire are clear-cut county cheeses, and Shropshire Blue is another one - even though it has nothing to do with Shropshire at all in origin. Then there's Yorkshire Blue, Dorset Blue Vinney, Oxford Blue, Wiltshire Loaf, Hereford Hop and Lincolnshire Poacher - all in https://en.wikipedia.org/wiki/List_of_British_cheeses

Forgot to add: Baloo is Single and currently just outside Gloucester - and contemplating an apple and a piece of Shropshire Blue. And planning to get some Hereford Hop before going back home. Nice.

Also - Somerset Brie; Olde Sussex (and Scrumpy Sussex); Suffolk Gold; Cornish Yarg

http://www.guntons.co.uk/acatalog/Cheese.html