chatgpt is generic (as in, no prior meaning attached, except for the few people in the world who understand what GPT stands for). It's simple - even a non-english speaker can say it easily, and doesn't require one to be native to know how to pronounce it (this is a difficult concept for a native english speaker to grok).
It's very weird to pronounce it as a French. Either you pronounce it like in English with a thick French accent like "tchat' djee-pee-tee" or like in French as "tchat' jay-pey-tey" which sounds exactly like "I farted". This is really a terrible name in French.
My aunt calls it "chat", "I asked chat", which is funny to my online-brain. Like she's a streamer with a permanent audience of 1. Hey chat, is this real?^1