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.
Mundaka
Others have related the name "Mundaca" to a stock of Basque toponyms with the endings "-aka", "-eka", "-ika", which are especially abundant in Biscay and which can be linked with the Celto-Italic suffix "-aka". To some the origin of the name would be much older and it could be traced back to an era in which Vizcaya could have been populated by a Celtic people.