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.
Réka
Réka is an old Hungarian female given name from the 10th century. It is of Hun descent, originally being Rika, derived from the Turkic Arikan. Over time it changed into forms like Kreka or Rekam and eventually into Réka. Although it is very difficult to find an affectionate form, there are some which are commonly used, such as Rékuci, Réki and Rékus. Its Finnish cognate is "Riikka".
Reka is also the Slavic word for "river." Reka is also a Sanskrit name and a Maori name. In Maori, Reka means "sweet."