Chevak Cupʼik or just Cupʼik (and sometimes Cugtun) is a subdialect of the Hooper Bay–Chevak dialect of Yupʼik spoken in southwestern Alaska in the Chevak (Cupʼik, Cevʼaq) by Chevak Cupʼik Eskimos (own name Cupʼit or Cevʼallrarmuit). Speakers of the Chevak subdialect refer to themselves as Cupʼik (as opposed to Yupʼik), while speakers of the Hooper Bay subdialect refer to themselves as Yupʼik (not Cupʼik), as in the Yukon-Kuskokwim dialect.
The Central Alaskan Yupik who live in the village of Chevak call themselves Cupʼik (plural Cupʼit), whereas those who live on Nunivak Island (Nuniwar in Nunivak Cupʼig, Nunivaaq in Central Yupʼik) call themselves Cupʼig (plural Cupʼit), the spelling differences serving as a self-designated cultural identifier between the two groups. In both dialects, the Yupʼik consonant c is pronounced as an English ch. The Cupʼik dialect is readily distinguished from other dialects of Yupʼik by the pronunciation of the Yupʼik "y" sound as a "ch" sound (represented by the letter "c"), and by some fundamental differences in the basic vocabulary.