I don't know about a tool. UMDgen has some game info features, but I don't think the game name is part of the format. The ISO has a name like NPJH-50511, I think these numbers are issued by Sony.
Anyway, extract PARAM.SFO in the root of your ISO and look at it using your hex editor (set encoding to UTF-8) and you should see the name of the game there at the bottom. You can change the game name in this way, as well.