It is my understanding that the name "Pellfolk" was assigned to the "Mattsson" family when one joined the military and they were told there were too many Mattssons. My great grandfather came to the United States and used the last name Mattson, dropping the second S. At least 2 of his children, Marie K Pellfolk and Axel Waldemar Pellfolk came across with their baptismal certificates using the name Pellfolk but changed it to Mattson like their father when they arrived.