Reindeer are called reindeer because they were originally native to northern Europe and Asia, and the word "reindeer" comes from the Old Norse language. In Norse mythology, the reindeer is associated with the god Odin and is believed to have magical powers that can help guide people through the dark winter months. Today, reindeer are still commonly used as transportation in parts of the Arctic, and their name has become a beloved part of the Christmas tradition.