List of adjectivals and demonyms for Cuba
The following are the 15 provinces of Cuba, along with their demonym or adjective form. Per Spanish morphology, the collective plural is made by adding an -s to pluralize the masculine singular forms listed, as in Cuba: cubano [masculine singular], cubana [feminine singular], cubanos [masculine plural] and cubanas [feminine plural].
Source: Wikipedia — List of adjectivals and demonyms for Cuba (CC BY-SA 4.0)