The French, on hearing the Argonese pronunciation of Aneto, retained the last two clearly accentuated phonetic syllables, ne and tu, ignoring the first syllable a. Based on such oral transcription, the French name Netou came to exist along with several historical variants: Nelto, Nettou, Anetthou, Annetton, Anelthou, Nethom or Aréthon, all used by various cartographers. Even though the summit and slopes are entirely within Spanish territory, the first extensive studies of the Pyrenees - and the only ones for the following 100 years - were French ones from the 19th century - starting with the very detailed study by Jean Daniel François Schrader (1844-1924) in 1874. So these names were the toponyms that were then used. It took Émile Belloc's renown work on the Pyrenees (notably on its hydrology, glaciology and etymology) to establish the name of Aneto as the official toponym; he consistently used that name in 1898 already.