China Naming Network - Auspicious day query - Why does the fortune teller know my name?

Why does the fortune teller know my name?

A few years ago, there was a little game in the night market, 2 yuan paid once.

It's similar to yours.

If I don't remember clearly, I may give you an answer, saying that you can know your last name and first name by picking up a few hundred words of paper, 2 yuan.