Hmm, yes. I wasn't confident of my answer, but I was also looking for the date it changed from Disneyland Paris to its current name, Disneyland Resort Paris!
I don't know Bonnie - just that it definitely changed sometime between 2000 and 2002!! It makes some sort of sense (to me anyway!) that they coincided it with the opening of the Studios - so that was my answer!! Oops!!!