There are at least two artists which use this name:
1. Jellyfish, a power pop band from the United States
2. An alternate tag for ＪｅｌｌｙＦｉｓｈ, a visual kei band from Indonesia 1.Jellyfish were a short-lived but highly influential power pop band from San Francisco. The core members were drummer/singer/songwriter Andy Sturmer, keyboard player/multi-instrumentalist Roger Joseph Manning Jr., and guitarist/songwriter/vocalist Jason Falkner.

Read more about Jellyfish on Last.fm.