The word "cashel" derives from the Latin "castellum" and was applied across early medieval Ireland to these roughly circular enclosures, which served as farmsteads and places of refuge for farming families between roughly the fifth and twelfth centuries. That the townland name preserves the monument's presence so directly is itself a small curiosity; the place and the structure have been naming each other for a very long time.

Beyond the fact of its existence and its classification, the detailed record for this particular cashel remains sparse in what is publicly available at present. What can be said is that Clare is unusually rich in ringfort remains of both the earthen and stone-walled varieties, partly because the Burren's thin soils and limestone geology made dry-stone construction practical and durable. A cashel built into that landscape could survive centuries of agricultural change simply because dismantling it was more effort than working around it. Whether Ballymulcashel's example sits within the Burren proper or in the softer lowland terrain to the south and east of the county is not clear from what is currently on record, but the townland name alone suggests the structure was substantial enough to define the place in the minds of those who lived alongside it.