Alaikumassalam wa rahmatullah,
Riyafeel seems to be the way some people in India and Pakistan refer to the angel Raphael, whose standard name in Islam is Israfeel. He is the angel who blows the trumpet that ends the world, and then blows it again for the Creation to be brought back to life.
Using the names of angels is allowed in Islam, for this reason you can use Riyafeel, Raphael, and Israfeel. The meaning of these words possibly come from the same ancient roots, which are related to healing that comes from God. However one sources says Israfel means "the burning one".