Eureka, California
"Eureka" received its name from a Greek word meaning "I have found it!" This exuberant statement of successful (or hopeful) gold rush miners is also the official motto of the State of California. Eureka is the only U.S. location to use the same seal as the state for its seal.
Carantania
Another possible etymology is that it may have been formed from a toponymic base "carant-" which ultimately derives from pre-Indo-European root *"karra" meaning 'rock', or that it is of Celtic origin and derived from *"karantos" meaning 'friend, ally'. Its Slovene name was adopted from the Latin *"carantanum". The toponym "Carinthia" (Slovene: < Proto-Slavic "*korǫt’ьsko") is also claimed to be etymologically related, deriving from pre-Slavic *"carantia". The name, like most toponyms beginning with *Kar(n)- in this area of Europe, are in turn most likely linked to the pre-Roman tribe of the Carni that once populated the eastern Alps.