ONLINE ETYMOLOGY DICTIONARY
- c.1600 (n.); 1610s (adj.), from L. Iberia, ancient name of the Spanish peninsula, from Gk. Iberes "Celtic people of Spain;" also the name given to an Asiatic people near the Caucasus. Of unknown origin in both uses, but the word as applied in Spain is believed to be related to the River Ebro. The earliest English reference is to the Caucasians; in reference to Spain and Portugal it dates from 1610s.
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Etymology
Northeast Iberian script from Huesca.The Iberian Peninsula has always been associated with the Ebro river, Ibēros in ancient Greek and Ibērus or Hibērus in Latin. The association was so well known it was hardly necessary to state; for example, Ibēria was the country "this side of the Ibērus" in Strabo. Pliny goes so far as to assert that the Greeks had called "the whole of Spain" Hiberia because of the river Hiberus.[10] The river appears in the Ebro Treaty of 226 BC between Rome and Carthage, setting the limit of Carthaginian interest at the Ebro. The fullest description of the treaty, stated in Appian,[11] uses Ibērus. With reference to this border, Polybius[12] states that the "native name" is Ibēr, apparently the original word, stripped of its Greek or Latin -os or -us termination.
The early range of these natives, stated by the geographers and historians to be from southern Spain to southern France along the Mediterranean coast, is marked by instances of a readable script expressing a yet unknown language, dubbed 'Iberian'. Whether this was the native name or was given to them by the Greeks for their residence on the Ebro remains unknown. Credence in Polybius imposes certain limitations on etymologizing: if the language remains unknown, the meanings of the words, including Iber, must remain unknown also. In modern basque language the word ibar means valley or watered meadow, while ibai means river, but there insn't also any proof relating the etimology of the Ebro river with these basque names.