The name of the Fenris wolf's destiny, prophesied to cause chaos during Ragnarök, is Fenrir. Fenrir is destined to break free from his bonds, leading to the downfall of the gods and the onset of catastrophic events. This prophecy illustrates the Norse themes of fate and inevitability, showcasing Fenrir as a harbinger of destruction. His role in Norse mythology emphasizes the cyclical nature of existence, where chaos ultimately leads to renewal.