After double-checking on Google, I stand corrected: alfredo itself is not a cheese, but alfredo sauce does rely on certain kinds of cheeses as ingredients - mostly light/white cheeses like parmesean or cream cheese.
But again, not all cream sauces depend on cheeses as ingredients. My mom has a seafood spaghetti in a cream sauce recipe, and the main ingredients in the such is heavy cream, flour, and champagne (along with mushrooms, green onions, and shrimp).