city in Iowa, U.S., named for Fr. Rivière des Moines, the river that flows past it, which traditionally is derived from Fr. des moines "of the monks," in reference to missionaries, but this probably is a fur trappers' folk-etymologizing of a name of the native people who lived there. The place
appears in a 1673 text as Moinguena, and historians believe this represents Miami-Illinois mooyiinkweena, literally "shitface," from mooy "excrement" + iinkwee "face;" a name given by the Peoria
Indians (whose name has itself become a sort of insult) to their western neighbors. It is not unusual for Indian peoples to have hostile or derogatory names for others, but this seems an extreme case.