John Hurved is the earliest reference to the surname 'Hurved' I can find, although he lived in Sandford I can find no reference to him being born in Sandford. This leads me to believe that Hurved is a misspelling of another surname and that he was born somewhere else not too far away.
My best lead so far has been John Hurwood in Poltmore born in 1760 which is only a few miles away just north of Exeter. Interestingly I followed this line of reasoning after I came across a Peter and Elizabeth Hurford in Hemyock, Devon that had a daughter Mary who was incorrectly recorded as Hurved instead of Hurford in one record, they also had a son called John Hurford. But I have no evidence only a hypothethis to tie either of these John Hurfords with this John Hurved.
Possible John Hurved 
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John is 35 degrees from Alfred Nobel, 40 degrees from Henri Becquerel, 27 degrees from Niels Bohr, 32 degrees from Marie Curie, 31 degrees from Alec Fleming, 25 degrees from Howard Florey, 37 degrees from Albert Imre Szent-Györgyi, 30 degrees from Barbara McClintock, 39 degrees from Wilhelm Roentgen and 30 degrees from Chandra Garrow on our single family tree. Login to find your connection.