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.
Eulgem
Werner Schumacher offers several possible derivations for the distinguishing prefix, but none is certain. It could be from the Latin for elm, or perhaps from "Olk" or "Ulca", meaning “land that can be worked by plough” or “land that is worked”. Schumacher also cites a Dr. Beestermöller who believes that the root may be a Celtic reference to wetlands.