ChatGPT is commonly referred to as Chappie (チャッピー) in Japan.

I’ve heard people call Gemini as Cemile (Jamila), and ChatGPT as Chipitty in Turkey.

Chat Jippity.

I just say jippity or sometimes "the jippity"

Many of my non tech friends would call it Chatty! Tbh I like it better than ChatGPT

Some older folks I know call it Chat Jippity non-ironically

I've heard in my home country Geppetto for ChatGPT. I'm not sure if it's still a popular term there.