Christmas songs try to incorporate the spirit of the holiday. Many traditional songs are instrumentals. Those with lyrics have been translated from the original language. They are recognizable and familiar. Most popular Christmas songs in the United States are sung in English. People learn to sing them.
Merry Christmas All Around the World, by Doxter S, is sung in 25 different languages. Doxter S wrote and recorded a version of this song in 2012 on a dare from one of his fans.It took another 5 years to find someone else who could learn to sing this song properly.
This is supposed to be a children’s Christmas song. The lead and backing singers are a little bit older. They share the same vocal range as many children, and often record voice-overs for children’s cartoons. They probably don’t sound like children, but they can sing “Merry Christmas” in 25 different languages.