A screenshot of a tweet from user ShinraArch (Shinra Archaeology Department) that says “FFVII Rebirth Director Naoki Hamaguchi says that Cait Sith’s name is pronounced “Cat Shee.” (Game Informer Shows, 12/21/2023)”. Attached on the tweet is a 3D model of Cait Sith from FF7 Rebirth on a black background
I am hoping someone, just someone, maybe Cid or Red XIII would call him Cat Shit.
You’re free to pronounce it however you want, but considering it’s named after a famous mythological character, you may get funny looks as if you referred to similar mythological characters as “Jod”, “Hey-zeus”, “Bud-hah”, or “Hurk-yoolz”.