Why do fortune tellers know your last name without asking?

Is it the kind of brand with hundreds of surnames that you see on the ground, so you can take out the extra surnames and put them on the corresponding brands on the ground? This is obviously a liar, because although the brand you choose has many surnames, it is only the same as your surname on the ground. If you hold it or put it on the ground, he will make a mistake. I don't know if this is the case. But there must be a knock at the door, or he will become a "fairy"! Immortals don't need money!