Well, that's probably the most dubious of the lot !
Reminder that the 'thorn' part of the word is out of 'thurse' or similar. Goblin, gremlin, little demon kind of thing.
Are you sure? Ekwall says that Thornborough simply means "Thorn Hill" ie a hill where thorns grew or "a burg protected by a thorn hedge". The latter seems more likely in view of the geography
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