Andersen
Scandinavian
This last name was originally a typical Scandinavian Patronymic: http://wiki.geni.com/index.php/Patronymics For Scandinavian families it was only introduced as a last name or family name around 1850-1900.
Søn af Anders = Andersen (danish)
Son of Anders = Andersen
Hans Christian Andersen (http://en.wikipedia.org/wiki/Hans_Christian_Andersen) was a famous danish writer, he wrote a lot of farytales, fx The Little Mermaide.