Agnes and Marius Mathisen

My g-great-grandmother arrived at Ellis Island on the SS Island in Nov 1902 from Christiana with her young daughter, Sigrid, to join her husband, Marius in Minneapolis. He had come over in 1901 or early '02, but I can find no record of him. In census' his name is Morrie, Mamie and Marius. And his last name varies as Mathson, Mathieson or Mathisen. Any ideas?