Originally it was a corruption of a term expressing enmity or contempt, applied to a part of the plains tribes by the forest-dwelling algonquian Indians.
"The Siouan Indians"
W. J. McGee
Belonging to Long Island, it is algonquian of course.
"The Lightning Conductor Discovers America"
C. N. (Charles Norris) Williamson and A. M. (Alice Muriel) Williamson
A confederacy, of algonquian stock, occupying the basin of the Delaware River.
"The Makers of Canada: Index and Dictionary of Canadian History"
Various