The other one is in Dublin
Two Ringsends
The Ringsend most Irish people mean is a Dublin suburb at the mouth of the Liffey — the one with the chimneys, the football ground, the village pubs. This one is a different place: a small north Derry village on the A29, in the Coleraine direction. The two share a name and nothing else. If you are searching for this Ringsend online, add 'Derry' or 'Londonderry' or the postcode will sort it for you.
Bridge of the rock
Droichead na Carraige
The Irish form of the name — Droichead na Carraige — translates as 'bridge of the rock', which suggests an old crossing point on a stream rather than anything to do with the Dublin Ringsend's Rinn Inn (the end of the point). The English name is the awkward fit here; the Irish one tells the older story. The crossing is on a small tributary running east toward the Bann.
Coleraine, the Bann, the Ironmongers
Plantation country
Ringsend sits inside what was the Coleraine portion of the seventeenth-century Londonderry Plantation — the same stretch of country that Garvagh and Aghadowey came out of, the lower Bann valley west of the river. Garvagh up the road belonged to the Ironmongers' Company of London and was laid out by the Canning family from 1615. Ringsend itself does not seem to have its own founding charter; it grew, as small Ulster villages did, around a road, a stream, and the farms that worked the land.