Full Idea
Change of denotation is decisive against the Causal Theory of Names. Changes of denotation actually occur: a hearsay report misunderstood by Marco Polo transferred the name 'Madagascar' from a portion of the mainland to the African island.
Gist of Idea
The Causal Theory of Names is wrong, since the name 'Madagascar' actually changed denotation
Source
Gareth Evans (The Causal Theory of Names [1973], §I)
Book Reference
Evans,Gareth: 'Collected Papers' [OUP 1985], p.11
A Reaction
This doesn't sound decisive, as you could give an intermediate causal account of Marco Polo's mistake. I might take the famous name Winston, and baptise my son with it. And I might have done it because I thought Winston was a German dictator.
Related Idea
Idea 13790 A name-giver might misname something, then force other names to conform to it [Plato]