Our modern English word comes from the Middle English
nowel, which Websters 1828 Dictionary defined as a shout of joy or Christmas song. The roots of the word are the French noel (Christmas season), which may come from the Old French nael. This, in turn, is derived from the Latin
natalis, meaning birth. Since Christmas is the celebration of the birth of Christ, it was natural for people to refer to the celebration as the nativity or the birth.
Another possible root for noel, also from the French, is the word nouvelles, meaning news. As the popular carol says, The first noel the angels did say / Was to certain poor shepherds. . . . The meaning of news certainly makes sense in that context; however, the early usage and definition of noel seem to focus more on the idea of birth, and that is probably the more accurate meaning. (https://www.gotquestions.org/Noel-meaning.html)