@persimmon: Thank you for your detailed comment.
I never thought about the second part but it makes sense to me.
Something that I've been always wondering about is that if this name should be known to the person who we are asking about? I mean, for example, if I am asking a psychic about my colleague can I give them my nickname while my colleague does not recognize me by that name? Based on your comment, my understanding is that this name is just for connection between me and the reader. If that's the case, then I should not worry about the third person.