Eryri and Snowdonia
The English-language name Snowdonia comes from Snowdon, the highest mountain in Wales, which rises to approximately 3,560 feet (1,085 metres). The Welsh name for the region is Eryri.
One familiar explanation connects Eryri to the Welsh word eryr, meaning eagle, giving the interpretation “land of eagles”. The source page also describes a scholarly interpretation linking the name to highlands and the Latin word oriri (“to rise”), associated with the work of Sir Ifor Williams.