Source : Webster's Revised Unabridged Dictionary (1913)

Miamis \Mi*a"mis\, n. pl.; sing. {Miami}. (Ethnol.)
   A tribe of Indians that formerly occupied the country between
   the Wabash and Maumee rivers.

Source : WordNet®

Miami
     n 1: a member of the extinct Algonquian people formerly living in
          northern Indiana and southern Michigan
     2: a city and resort in southeastern Florida on Biscayne Bay;
        the best known city in Florida; a haven for retirees and a
        refuge for Cubans fleeing Castro