A cillín (sometimes spelled cillin) was an informal, unconsecrated burial ground used in Ireland for unbaptised infants and others excluded from consecrated ground, typically situated at the margins of parishes, beside old ruins, or near ancient boundaries. The name attached to this particular field points to the likely presence of just such a place, close to the remains of a church known locally as Teámpall beag, meaning 'the little church', and recorded more formally as Templeboy Church.

The difficulty here is one of layered uncertainty. O'Kelly, writing in 1969, noted the local name and its implication, but the precise location of Templeboy Church itself has never been firmly established. The Ordnance Survey's first edition six-inch map of 1839 marks a rectangular area of roughly 50 metres east to west and 15 metres north to south near the words 'Site of Templeboy Church', with the southern and eastern portions rendered in dotted lines, suggesting approximation rather than certainty. Ten metres to the north, in an adjoining field, the same map marks a holy well called Toberboy. By the time of the 1900 revision, the church site had been relocated slightly, indicated by a cross within a small enclosed field to the west of the earlier Gothic script. That small field has since been removed entirely from the landscape, though fragments of its boundary survive. Nothing remains above ground at either candidate location, and the possible children's burial ground is currently placed, provisionally, within an unenclosed area at the north-west angle of a reclaimed field.

What makes this site quietly compelling is precisely its elusiveness. The holy well, the fragmentary field boundaries, the vanished enclosure, and the name 'Cillín field' are all that remain of what was once, in local memory at least, a recognised place of burial and perhaps of devotion. The landscape has been reclaimed and rearranged, but the name persisted long enough to be recorded, which is often how these places survive at all.