Iguion is an enemy in Final Fantasy X, found in the Macalania Woods. It has high Agility and Evade, so Tidus's or Wakka's physical attacks work the best. Like other enemies of its kind, Iguion's attacks will cause Silence or Petrify.
Iguion comes from "iguana." Iguana is a genus of herbivorous lizards native to tropical areas of Mexico, Central America, several islands in Polynesia and the Caribbean. Two species are included: the green iguana widespread throughout its range and a popular pet, and the Lesser Antillean iguana native to the Lesser Antilles and endangered due to habitat destruction. The word "iguana" is derived from the original Taino name for the species, iwana.