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As I said in another comment, just bear in mind the possibility that the map of 878 England from the 19th century could well be based upon the same evidence. Although it is significant that the names survive and show clear boundaries, it may well be a lot less significant that a modern map and a 19th century map show the same boundaries.

Quite a lot of what is now Scotland was Norse for a long time - the most obvious name being "Sutherland" (Suðrland) which is extreme north west of the island of Britain:

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

-thorpe, from either old nose or Anglo saxon also shows another nice geographical line. Complements the defaults selected on the page nicely:

https://placenames.rtwilson.com/#W3sidGV4dCI6ImJ1cmdoIiwiY29...

The Norse vs. Old English vs. Roman place naming also explains the inconsistent pronunciation (see other subthread)

So very interesting. Thank you!