Max, all the people in Murano call him Antonio Da Ros. It is the way it is written in the books by everyone, including the Baroviers and Heiremans. We don't know anything, really, about the person who wrote here only once. It may be that Antonio's real name was Daros, but he may have designed under the name Da Ros. I figure that if the Marino and Marina Barovier call him Da Ros, and they knew him, I would follow their lead.