is Vivaldi intended for a small group of developers only? no? you want non-developers to use it?
I don't understand your gripe with that name in particular. It's not an obscure name, and it evokes some sense of classical grace (as well as being an extension of the Opera name in a sense). There are any number of other projects out there, both successful and otherwise, that have much more ridiculous names. Firefox is a great example. What does "Firefox" have to do with being a web browser? Or SeaMonkey, or Chrome for that matter? What about Twitter? Or Flickr? What about LibreOffice, which I have to actually spell for people who haven't heard of it? How about "The Gimp?" But you're choosing to go on a rant over the name of a classical composer, as if no one has heard of this person?
In the first place, people are obviously fine with using things with names that don't have an obvious connection to the product. In the second place, plenty of people have actually heard of Vivaldi (the man). It's not as obscure as you apparently think it is.