The word caher, from the Irish cathair, refers to a stone-walled enclosure, typically circular, of the kind built across Ireland from the early medieval period onwards. Finding the word embedded in a place name is often the first clue that something old and structural survives nearby, or once did, the landscape itself holding the memory of a monument that maps and records have not yet fully caught up with.

Cahernalinsky sits in County Galway, a county whose western reaches are dense with such enclosures, from the grand stone forts of the Aran Islands to the more modest ringfort-type enclosures that once organised farmsteads and defined territory across the limestone plain of the Burren's eastern edges and the rougher ground beyond. An enclosure of this kind would typically have served as a defended farmstead, its walls encircling a domestic space where people lived, kept animals, and worked land during the early medieval centuries, roughly 500 to 1000 AD, though some were built and used outside those dates. The specific details of Cahernalinsky's enclosure, its dimensions, its construction, and its current condition, remain to be fully documented in the public record.