Source : Webster's Revised Unabridged Dictionary (1913)

Cayugas \Ca*yu"gas\, n. pl.; sing. {Cayuga}. (Ethnol.)
   A tribe of Indians formerly inhabiting western New-York,
   forming part of the confederacy called the Five Nations.

Source : WordNet®

Cayuga
     n 1: a member of an Iroquoian people formerly living around
          Cayuga Lake in New York state
     2: the Iroquoian language spoken by the Cayuga people