If Roland knows the ship has a name, it does. He might not actually know what it is, but from experience, if he says it does, he is well enough connected to have been told from sources beyond question. I know it is a big tease to know he knows, and yet not find out, but to be fair to him, I'd rather take the tid-bits than know nothing at all.
Besides, like the amusement park industry, my favorite analogy to the cruise industry, letting slip the name of a ship is like revealing what the next "biggest" coaster is going to be like or called. In the cruise world, you don't want to allow your rival to suddenly name their next ship what you were going too. Among other things.