Owl: Old English ūle, of Germanic origin; related to Dutch uil and German Eule, from a base imitative of the bird's call.
Nothing to do with "Yule" at all, actually. x3 We delve into real-life word origins a lot for our Creatu, actually. Often, the process of choosing a name starts with one defining characteristic, then steals one of the word's ancestors, and tweaks it to be a bit more appealing to they eye and tongue.