That quiet disagreement is itself telling. The well is generally called Tobar Naomh Seosaimh, meaning the Well of Saint Joseph, but a single local informant recorded it under the older and considerably stranger name of Tobar Crom Dubh. Crom Dubh, the dark crooked one, is a figure from pre-Christian Irish tradition associated with the last Sunday of July, a day once called Domhnach Crom Dubh and later absorbed into the feast of Lughnasa. The fact that this well is visited on precisely that Sunday sits at an interesting intersection of the old calendar and the newer Christian naming.

Holy wells in Ireland are typically natural water sources, sometimes with stone surrounds or votive offerings nearby, that have accumulated layers of devotional use over centuries. They were visited on pattern days, fixed calendar dates tied to a local saint or seasonal cycle, often involving circumambulation of the site, prayers, and the leaving of rags or small objects. The pothole at Leighon Island fits this pattern in stripped-down form: no elaborate stonework is recorded, just a natural feature in the rock near the shoreline, animated once a year by the people who come to it. The dual naming suggests the site carries older memory than its Josephine title implies, the Crom Dubh connection anchoring it to a pre-Christian harvest tradition that the Christian calendar quietly overlaid rather than erased.