what is the name of demon in book wind?

It seems you are referring to a book called "Wind". There is no widely known book with that exact title that features a demon.

Could you please provide more information about the book you're asking about?

For example, you could tell me:

* The full title of the book

* The author of the book

* Any other details about the book or the demon

With more information, I can help you identify the demon you are looking for.