So I am at a great Italian restaurant and I read the wine list and see "Vino Santo" so I tease the owner, a friend. I have NEVER seen it written "Vino Santo," ONLY Vin Santo; it even said Vin Santo right on the label. He said, "No, it can be either." Now, grammatically, I can see what he's saying. But, please, have you ever seen it as "vino santo"?