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.
Bucca (mythological creature)
Use of the term Púka in Ireland, however, may predate the arrival of Norse settlers and could be an alternative origin of the word with considerable cultural exchange with Ireland occurring in the Early Christian era.