A Jinchuuriki is just a title for those that are host to Biju ["tailed beasts"]. Naruto is a Jinchuuriki. Gaara was a Jinchuuriki.
Currently in the series, "Mr. Host" has no name. He is nothing more than the host of the Hachibi ["Eight Tailed Beast"]. No more, no less. He hasn't shared his name at all.
Furthermore on the entire subject and topic, there are no demons in Naruto. The Biju are nothing more than animals comprised of massive amounts of chakra. They are not gods. They are not demons in any religious sense of the word. They are only seen as "demons" by the locals because of their affinity to wanton destruction, but the truth of the matter is that they are not demons at all and they are just nothing more than the physical manifestations of chakra in it's purest.