In Welsh, Ferndale is known as Glynrhedynog, the name of one of the old farms on which the town is built. In its infancy Glynrhedynog was also known as Trerhondda after the name of the first large chapel to be built in the town. The naming of settlements after chapels was widespread in Wales at the time, as is shown in village names such as Bethesda, Beulah and Horeb, but neither Glynrhedynog nor Trerhondda was destined to be used for long.