Glyn Ceiriog is the principal settlement of the Ceiriog Valley. Confusingly, Glyn Ceiriog translates simply as Ceiriog Valley, though there are other villages in the valley. The village is technically known, in traditional Welsh naming style, as Llansantffraid Glyn Ceiriog or sometimes Llansanffraid Glyn Ceiriog, which means church of St Fraid (the Welsh name of St Bridget) in the Ceiriog Valley, but it has come to be known simply as Glyn Ceiriog, or even Glyn for short. The name Llansanffraid is now more associated with other villages of the same name.