Is it good to ask a demon for its name?
It doesn’t hurt a thing and it can be very helpful. You must be aware that demons can lie though, so you can’t bank on what they tell you. But if you can get ahold of their name, it gives you a good handle to get their attention with. If somebody shouts “Hey you!” in a crowd, it probably won’t get your attention, but if somebody shouts, “Hey Bob!” (providing that’s your name), it will get your attention in no time. Having the demons name also gives you an idea of what his purpose and function is, as well as what other demons to look for in the person.