The Brittonic, Brythonic or British Celtic languages (, , ) form one of the two branches of the Insular Celtic language family; the other is Goidelic. The name Brythonic was derived by Welsh Celticist John Rhys from the Welsh word Brython, meaning an indigenous Briton as opposed to an Anglo-Saxon or Gael. The name Brittonic derives ultimately from the name Prettanike, recorded by Greek authors for the British Isles. Some authors reserve the term Brittonic for the modified later Brittonic languages after about AD 600.