That doesn't even work, I'm fully doxxed here and in other places and it has no idea what my name is.
Even for OP it doesn't work, it just guesses "H* Boppre" (with a different name liks Hans, Horatio, etc. every time) which just so happens to be close enough to their actual name because their nickname is their real surname.
You won't get the same response all the time and you may need to massage the query for each context/person to find the right answer. It doesn't mean it doesn't work - that's just how this system presents answers. Don't expect 100% accuracy.
Also keep in mind even obvious / common things may not be indexed, but openai gpt3 will rather make something up than say it doesn't know. So if you get randomness, maybe it just doesn't know.
You found try something like "The full name of the person with username skywal_l is"
(the answer given is "Skyler Wall")