The last name, Maudal, is a farm name in Norway.
The Maudal children's father, Karl Elias Mauritssen (b. 12-22-1870 in Ovre Maudal, Gjesdahl parish, Rogaland County, Norway) was the son of Maurtis Rasmusson (b. 3-15-1835) and Sara Teoline Olsdatter (b. 1837 in Stuhaug farm, Bakke in Sirdal, Norway). He emigrated from Norway in 1900, and married Mary Olson, also born in Norway, in 1912 in Iowa.