Various companies buy and sell records about users.
If you didn't accidentally copy your name in from an email, my guess is that it was added based on some data it had about you from the company.
Creepy.
Meanwhile there's various information that ChatGPT and the other AI chats refuse to answer.
I am interested in the various AI chatbots for the future but I think they're still lacking in many regards and need more fact checking added.