Among the more popular theories:
- When a visitor hailed a pioneer cabin in Indiana or knocked upon its door, the settler would respond, "Who's yere?" And from this frequent response Indiana became the "Who's yere" or Hoosier state. No one ever explained why this was more typical of Indiana than of Illinois or Ohio.
- That Indiana rivermen were so spectacularly successful in trouncing or "hushing" their adversaries in the brawling that was then common that they became known as "hushers," and eventually Hoosiers.
- There was once a contractor named Hoosier employed on the Louisville and Portland Canal who preferred to hire laborers from Indiana. They were called "Hoosier's men" and eventually all Indianans were called Hoosiers.
- A theory attributed to Gov. Joseph Wright derived Hoosier from an Indian word for corn, "hoosa." Indiana flatboatmen taking corn or maize to New Orleans came to be known as "hoosa men" or Hoosiers. Unfortunately for this theory, a search of Indian vocabularies by a careful student of linguistics failed to reveal any such word for corn.
- Quite as plausible as these was the facetious explanation offered by "The Hoosier Poet," James Whitcomb Riley. He claimed that Hoosier originated in the pugnacious habits of our early settlers. They were enthusiastic and vicious fighters who gouged, scratched and bit off noses and ears. This was so common an occurrence that a settler coming into a tavern the morning after a fight and seeing an ear on the floor would touch it with his toe and casually ask, "Whose ear?" Source: Indiana Historical Bureau.