A surname, from given names.
"The Larson family has lived in that small town for generations."
Larson began as a Middle English nickname for someone named Lawrence before becoming a popular American spelling variant of the Scandinavian names Larsson, Larsen, and Larsén. While it originally indicated "son of Lawrence," its use in the United States largely reflects an anglicization of these foreign surnames rather than a direct lineage to the name Lawrence.