I've never heard Vincentia used. It would be
Vincenza, which is used but not so much because is generally considered very ugly. There's also the nickname Enza as a possiblity (another name that's generally considered ugly).
Victoria seems a stretch, and anyway the Italian form of
Victoria is
Vittoria.
Btw, Vincentio isn't used either, it's always
Vincenzo. Shakespeare's Italian names are often a little weird, at least for modern standards.
Formerly Known as Murasaki