From a Dakota winúŋna. While not originally used as a personal name by the Dakota, it has been adopted as such by English speakers.
John Koontz suggested that the name was a compound of wi- + no + -na (a diminutive suffix) and thus a reflex of Proto-Siouan *rǫ/*nǫ. That root is otherwise unattested in the Sioux languages, which use reflexes of *wį(y)ą instead, and a more prosaic analysis identifies the first elements of the name with winyan.
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