utopia (n.) Look up utopia at Dictionary.com
1551, from Modern Latin Utopia, literally "nowhere," coined by Thomas More (and used as title of his book, 1516, about an imaginary island enjoying the utmost perfection in legal, social, and political systems), from Greek ou "not" + topos "place" (see topos).

Extended to any perfect place by 1610s. Commonly, but incorrectly, taken as from Greek eu- "good" (see eu-) an error reinforced by the introduction of dystopia (1868). On the same model, Bentham had cacotopia (1818).