Translation according to P. W. Joyce:
Trellick in Galway; Tri-liag, three pillar-stones. Like Trillick, vol. i. p. 263 [reproduced below].
The erection of three stones like those at Duntryleague must have been usual, for we find several names containing the compound tri-liag, three pillar stones. It occurs simply in the form of Trillick, as the name of a village in Tyrone, and of two townlands, one in Donegal and the other in Fermanagh. In the parish of Ballymacormick, Longford, there are two townlands called respectively, Trillickacurry and Trillickatemple, the trillick or three stones of the marsh, and of the church. Near Dromore in Down, we find Edentrillick, and in the parish of Tynan, Armagh, Rathtrillick, the first the hill brow, and the second the fort, of the three pillar stones.