Zaneta (T) is a diminutive of Giovanna, a feminine form of John.
Zuana (T) is a feminine form of Zuane, a Venetian form of Giovanni (i.e., John). It means “God is gracious.”
Zane (I) is a Venetian form of Gianni, a short form of Giovanni.
Zilio (T) is a form of Gilio, which I suspect ultimately derives from Giles. Its origins are the Latin name Aegidus and the Greek word aigidion (young goat).
Zorzi (I) is a form of Giorgio (i.e., George), and means “farmer.” This is a surname in modern Italy.