Can I write my name on the prayer flag?

Generally, the names of buddhas and bodhisattvas are on the prayer flags, or some merit cards in temples. It's best not to have family names on it, which will consume his blessings. In fact, you can ask the monk Dade to return, or you can return by yourself. It's best not to leave a name or anything when doing merit. That doesn't mean much in practice, but it may not be very good.