Other sources, such as Manuel Álvarez Nazario and Luis Hernández Aquino, put forward the theory that it comes from the plural of cibales, plural form of ciba, meaning "stony place" or "place of stones" in Taíno, which "had undergone loss of the intervocalic -b- and the addition of the Spanish suffix referring to place -al." Lisa Cathleen Green-Douglass, who carried out a study of toponymics in Puerto Rico and compared both theories, believed the latter to be most plausible since Coll y Toste, per Green-Douglass, must have defined an anagram as a reversal of syllables and the resulting "Cial" or "Cyal" would have to then be made plural.