People who don't know any Italian would surely butcher the pronunciations of Guerciotti, Pogliaghi, Legnano, etc. The interesting thing is that most Italians don't know how to pronounce CIöCC either, because it's not a real word, and it only uses half of the Italian rules for pronunciation.

Compare to Cervelo - which is a made up word supposedly the first half of the Italian word for "brain", added to the word Velo. But the guy who made up the word gets to decide what the pronunciation is and he doesn't use the Italian rules either - so almost nobody pronounces it the way it should be by the rules... except maybe Italians who don't know it doesn't follow the rules.