Holy wells, known in Irish as tobar, were focal points of pre-Christian and later Christianised ritual across Ireland, typically associated with a named saint and visited on a particular feast day in a practice called a pattern, from the Irish patrún. The name Eunna likely refers to a local or regional saint, though variants of the name appear across Connacht in different forms, suggesting a figure whose cult spread through oral tradition rather than formal ecclesiastical record.

Beyond its name and its classification as a monument of archaeological interest, the documentary record for this particular well is thin. That silence is itself telling. Thousands of holy wells survive across Ireland, many of them unexcavated, undated, and known mainly through local memory and the persistence of the name in the landscape. Their archaeology tends to consist of the well itself, sometimes stone-lined, occasionally accompanied by a bullaun stone, a rock with a carved hollow used for collecting rainwater believed to have curative properties, or by votive offerings left by visitors over generations. Whether any such features survive at Tober Eunna is not currently documented in the public record.