Italian:
* Frahn-CHESS-kee (the "ch" sound is like the "ch" in "church")
English:
* Frahn-CHESS-kee (similar to the Italian pronunciation, but the "ch" might be slightly softer)
* Frahn-CES-kee (the "ch" sound is like the "ch" in "chest")
French:
* Frahn-SHEH-skee (the "h" is silent, and the "s" is pronounced like a "z")
It's best to ask the person whose name it is how they prefer to pronounce it!