I think they are all terrible. Not trying to be a dick, but as a huge metal fan, I wouldn't think twice about a band called any of these. Infinite Malestorm? Sounds too much like Alestorm (Pirate Metal from Scotland). Frozen Hell sounds like a bad one man Black Metal band with bad production values. Hydro Fire isn't bad, sound like an Industrial band too me personally. And the last one, while funning, isn't going to get you taken seriously by any real metal fans or by other groups you will be playing shows with. When I used to put on shows, if someone came to me with a name like that and wanted to do a show with us, I wouldn't have taken them serious and wouldn't have bothered unless the music really blew me away. Good luck on trying to find a name. It would also help if you said what kind of metal you were doing. Doom? Goth? Symphonic? Death? Viking? Power? Black? Neo-Classical? It does matter, even if you think it shouldn't. Good luck with your music as well.