The well is dedicated to St. Mochua, whose name the settlement itself carries, yet Ordnance Survey cartographers labelled it Tobermacduach rather than its correct form, Tobermochua. It is a small, telling detail, the kind that accumulates quietly around medieval sites in Ireland, where saint's cults, placenames, and parish records each carry slightly different versions of the same memory.

The placename itself is old and legible. The scholar John O'Donovan rendered the Irish as meaning 'abounding in oaks', and the dedication to Mochua gives it its full form, Darragh of Mochua. The site appears in documentary record as a boundary marker in King John's charter to Magio, dated between 1185 and 1200, where it is named as 'Darrach Mochua, with the court of the monks of Limerick'. From there the name shifts through the medieval record, appearing as Dermochi in 1300, Darmecho in 1301, Darmocho in 1418, and Der McCowe by 1633, before arriving at the familiar Darragh in a 1659 Down Survey entry. Bishop Robert granted half the church to a convent on the Blackwater near Youghal, suggesting the site was drawn into a wider network of ecclesiastical administration. A record from the Memoranda Rolls shows the sheriff inquiring into rents held by Isabella de Cogan and Garrett de Rupe, Lord of Fernagena, in the surrounding area, indicating the usual tangled overlap of Norman landholding and older ecclesiastical boundaries. Thomas Johnson Westropp, recording the ruins in his 1904 to 1905 survey, noted a nave and choir measuring roughly 18.4 metres by 7 metres, with a smaller chancel section of about 8.2 by 5.2 metres. Three gables were still standing in 1840, the walls roughly 73 centimetres thick, and the east window retained a pointed light with a flat splay cut from gritstone.

The ruins sit in County Limerick and the holy well, Tobermochua, is recorded separately under its own monument reference. St. Mochua's feast day falls on the 3rd of August, which was traditionally the occasion for patterns, the local devotional gatherings once held at holy wells and church ruins across Ireland. The east window detail, gritstone with a flat splay, is worth looking for if the masonry is accessible, as it suggests craft and material choices made at a specific moment in the building's medieval life. The well's misattribution on older maps is worth noting before consulting any printed guides to the area.