Well, that took me all of 2 minutes to refute my own findings...
Google's arch-nemesis, the evil Wikipedia, fired back and states:
A popular myth concerning d'Aviano says that he invented the Cappuccino after the Battle of Vienna. No mention of this occurs in any of d'Aviano's biographies or in any contemporary historical sources. Indeed, the story does not appear until the late 1980s, which indicates that it was possibly made up as a joke.
still, it's a cool name right?