What does Aria mean?
From the Italian word 'aria', meaning 'air' and, in music, a solo melody or song. An identical-looking name also exists in Hebrew (related to 'aryeh', lion) and Persian, but the modern popularity rests on the Italian 'melody' sense.
What does Gianna mean?
Italian feminine form of Gianni/Giovanni (John), from Hebrew 'Yochanan' meaning 'Yahweh is gracious / God is gracious'.