MiamiyoudaoicibaDictYouDict[Miami 词源字典]
place name in U.S.; the one in Florida is of unknown origin, attested in Spanish as Maymi (1566), Mayaimi (1575). The one in Ohio is from the Miami, native people there, attested from 18c., apparently from a native word /myaamiwa "downstream person."[Miami etymology, Miami origin, 英语词源]