No stone, no outline, no earthwork marks the spot where Cill Ósró once stood. The building has vanished so completely that nothing visible remains above ground, yet the field where it stood is still known by the old name, quietly preserving a memory the landscape itself no longer shows.

The name Cill Ósró follows a common pattern in early Irish ecclesiastical place-names, where "cill" denotes a church or monastic cell, often one of considerable antiquity. Beyond the name, almost nothing is recorded about who built here, when, or for whom. The form was noted by An Seabhac, the pen name of the Kerry writer and language scholar Pádraig Ó Siochfhradha, who documented it in 1939 as part of his work on the place-names of the Corca Dhuibhne region. That a local field name should outlast every physical trace of the structure it commemorates is not unusual in Ireland, where oral and linguistic tradition has often preserved what stone and mortar could not. The name is, in this case, the entire record.