You probably will never find a good answer to that question. Generally speaking the term "brand" doesn't seem to apply to violins the way it does to some things like guitars, for example.  For the most part, it appears that there are shops around the world that produce violins, either finished or unfinished, from low quality to high quality and they send them to a few wholesale distributors located here in the states, who then finish them and/or set them up, slap some italian name on them and sell them.  

There are exceptions, of course, like Giiga, Ming Jiang Zhu, Cicilio, etc. that allow you to know what shop(s) made them, but more often than not, it appears that for violins, this is not the case.

For example, there is a nice line of advancing student violins and fiddles called Martin Beck that is showing up more frequently in the hands of blue grass and old time fiddlers.  They come through Eastman, I think.  Where were they made?  As close as I've ever come to an answer was "a small shop in Romania."  They are sent to Eastman "in the white" where they are completed, varnished and set up, then sold as "Martin Beck."  They are really good fiddles, but who makes them?  Only Eastman knows. 

The other exception is violins that are made by well known makers, who make very few and very expensive violins.