Jahn-nee Skee-kee
* Gianni: The "i" in "Gianni" is pronounced like the "i" in "machine".
* Schicchi: The "ch" is pronounced like the "k" in "kick". The "i" is short, similar to the "i" in "ship".
Therefore, the full pronunciation sounds like "Jahn-nee Skee-kee".