BCNumismatics
The name ‘Graubunden’ is more commonly known in English.
Is there any reference for this? It should anyway be Graubünden, and it is already searchable.
According to ngrams, Grisons is still more frequent in English.
Also, the official website of the canton refers to it as Canton Grisons (on the English version).
I would support the change to “Grisons, Canton of the”, again as this is how it is referred to in the literature, including on the official website.