1706, from Latin Etruscus "an Etruscan," from Etruria, ancient name of Tuscany (see Tuscan); of uncertain origin but containing an element that might mean "water" (see Basque) and which could be a reference to the rivers in the region.
1811 (adj. and n.), from French, from Spanish vasco (adj.), from vascon (n.), from Latin Vascones (Vasconia was the Roman name for the up-country of the western Pyrenees), said by von Humboldt to originally mean "foresters" but more likely a Latinized version of the people's name for themselves, euskara or eskuara.
This contains a basic element -sk- which is believed to relate to maritime people or sailors, and which is also found in the name of the Etruscans .... [Room, "Placenames of the World," 2006]
Earlier in English was Basquish (1610s, noun and adjective); Baskles (plural noun, late 14c.; compare Old French Basclois); Baskon (n., mid-15c.). Biscayan also was used. In Middle English Basques were not always distinguished from Spaniards and Gascons.
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Definitions of Etruscan from WordNet
a native or inhabitant of ancient Etruria; the Etruscans influenced the Romans (who had suppressed them by about 200 BC);