Ciguayo (Siwayo) was the language of the Samaná Peninsula of Hispaniola (now the Dominican Republic) at the time of the Spanish Conquest.

The language appears to have been moribund at the time of Spanish contact, and within a century it was extinct.

[1][2] Ciguayo was spoken on the northeastern coast of the Roman Catholic Diocese of Magua from Nagua southward to at least the Yuna River, and throughout the Samana Peninsula.

The only attested words are "gold", tuob (presumably [tuˈob] or [ˈtwob]) and a few place names such as Quizquella (presumably [kisˈkeja]), meaning "very mountainous."

as languages of those families have simple V and CV syllable structures even in loanwords that were originally CCV or CVC.