The name Iowa (meaning "sleepy ones") was taken from a tribe of Siouan Indians (probably of Winnebago stock), which for some time had dwelt in that part of the country and were still there when the first white men came - the Frenchmen,.
Col.; Sastean, Or.; Shahaptian, Or.; Shoshonean, Interior Basin; Siouan, Mo.
Muskhogean tribes were potters, but Siouan tribes, as a rule, in all the Mississippi drainage were not.
Another quasinegative notion of more restricted distribution is that of the mysterious or strange, as we have it expressed, for example, in the Siouan wakan, though possibly this is a derivative meaning.
Dorsey, A Study of Siouan Cults, in No.
The Caddoan family was represented by the Middle or Pawnee Confederacy; the Siouan family by its Dakota, Thegiha, Chiwere and Winnebago branches.