In earlier times, Titlis was known under the names Wendenstock or Nollen. The Reissend Nollen and the Wendenstöcke are the nearest western neighbours to the mountain, slightly lower than Titlis, but with sharp rugged peaks. In a document of 1435 the mountain is called Tuttelsberg (Tutilos mountain), referencing to a man named Tutilos, who was probably a local farmer. The name, from Tutilos Berg, became Titlisberg and later Titlis.