Ah, the arcane rules of censuswhackery!
I'm afraid a 'total censuswhack' is only possible if both the first and second names are unique (not the combination of the two, Comosus

).
By the same token, there are almost 1300 Israels in the 1841, 55 Stockills and 15 Stockhills, and similar numbers in 1851, so the International Federation would not count this as a Censuswhack I'm afraid. The same would hold true of the Turvey's.
BUT (!) there are no other Shannonos (curiously!) so this IS a Censuswhack!
Etelyncupirby is wonderful, and a clear Censuswhack - I wonder if any of the Indian transcribers of the 1841 thought 'Hey that's a lovely name, I think I'll christen my next one after them!'
Now then, are we all clear about the rools?

cheers
Paul