Tobermacduagh translates roughly from the Irish as "the well of the son of Duach", a dedication that points toward St Colman Mac Duagh, a sixth-century hermit and bishop whose cult was centred primarily in County Galway, at the site that would become the monastic settlement of Kilmacduagh. That a holy well in the townland of Killeen, County Mayo, should carry his name suggests the reach of his veneration was wider than his Galway associations might imply. Holy wells in Ireland were typically sites of pattern days, localised devotional gatherings held on a saint's feast day, where people walked a prescribed circuit, prayed at stations, and left offerings of cloth or coins near the water. Whether that kind of ritual life once attended this particular well is, for now, difficult to say with any precision.

St Colman Mac Duagh is said to have lived as a hermit in the Burren for a period before founding his monastery, and dedications to him survive in scattered pockets across the west of Ireland. The Killeen townland in Mayo places this well in territory where early Christian memory was long and the landscape still carries traces of medieval and prehistoric activity in its field systems and placenames. Beyond the dedication itself and its location, the documentary record for this site remains sparse, which is itself a reminder of how many such wells survive in the landscape as little more than a name on a map, their histories partially dissolved into the ground around them.