The last name Defoe is a Native American last name...very common in the Ojibwe culture. Many of my cousins and close friends who are also Native American share that last name.
Sisseton, SD is also the home of the Lakota Sioux tribe. It has been said that some of the relatives who have passed on my Grandpas side were half and 1/4 Sioux. This is something that has always been told throughout the years.