It's pronounced the same as in English.
Gianna is a short Italian female form of the name John, which is Hebrew for "God is gracious".
Gianna because most proper names don't change
O lo'u igoa o Gianna
Gianna Olivia Gianna Brianna Gianna Caitlyn Gianna Bethany Gianna Vanessa Gianna Veronica Gianna Rose Gianna May (or Mae) Gianna Jasmine Gianna Mikayla Gianna Isabelle Gianna Isabella Gianna Madeline Gianna Courtney
Go clean your room right now! By Gianna Trombetta
Gianna Amore is 5' 7".
You say 'Yalda' in Hebrew
In Italian, Gianna is a diminutive of Giovanna, meaning "God is gracious". In Greek, Gianna means "God is merciful". In Spanish, Gianna does not have a specific meaning as it is not a common name in Spanish-speaking countries.
Gianna Patton's birth name is Hilary Gianna Patton.
Gianna Costa's birth name is Gianna Alissa Costa.
Gianna Zales best friend's name in Brilliant Fall of Gianna Z is Zig.
Gianna Distenca's birth name is Gianna Abbigail Distenca.