Zanetta could be an Anglicised form of
Zsanett (the Hungarian cognate of
Jeanne /
Johanna). Here it is in the official Hungarian names list:
http://www.origo.hu/utonevtar/index.html?id=2590 - unfortunately also in Hungarian, but you can see where they refer to
Johanna. I believe that the 'zs' is pronounced something like the 'zh' sound (ie the j in the French masculine
Jean), but if the name was Anglicised then that could have been transposed into a straight 'z'.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.