The Larson surname has its roots in Scandinavia, specifically in Norway and Sweden. It is derived from the Old Norse name “Larsen,” which means “son of Lars.” Lars was a popular given name in Scandinavia during the Middle Ages, and the surname Larson became common among the descendants of those named Lars. Today, Larson is a common surname in many countries around the world, including the United States, where it is often spelled with a “o” instead of an “a” (i.e. Larson vs. Larsson).