It appears in history under the Basque names Ondarribia and Hundarribia. The romances Fontem Rapidum and Fuente Rrabya are also cited, as well as the toponyms Monzón or Andara and the port of Asturiaga or Astuniaga. The etymology of the first can be read, in accordance with the local paleogeography, as “sandy ford,” as noted by Serapio Múgica. It appears in a Basque text from 1778 with identical sound and spelling, and with an organic final a.