Gracious
A diminutive form of Gianna, which is the Italian feminine version of John. It ultimately derives from the Hebrew name Yochanan, signifying that God has been merciful or gracious.
Less common today
Giannie isn't in the latest US Top 1000. It last peaked at #9,905 in 2008.
US births per 5-year period, 1990βpresent (SSA data).