Westerman was born Floyd Kanghi Duta Westerman on the Lake Traverse Reservation, home of the Sisseton-Wahpeton Oyate, the Eastern Dakota subgroup of the Great Sioux Nation, in the U.S. state of South Dakota.
Westerman was born Floyd Westerman ("Kanghi Duta") on the Lake Traverse Reservation, home of the Sisseton Wahpeton Oyate, a federally recognized tribe. It is one of the tribes of the Eastern Dakota subgroup of the Great Sioux Nation, living within the U.S. state of South Dakota.