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.
Eboracum
The name "Eboracum" comes from the Common Brittonic "Eburākon", which means "yew tree place". The word for "yew" was "*ebura" in Proto-Celtic (cf. Old Irish "ibar" "yew-tree", (older "iobhar"), , "alder buckthorn", "alder buckthorn"), combined with the proprietive suffix "*-āko(n)" "having" (cf. Welsh "-og", Gaelic "-ach") meaning "yew tree place" (cf. "efrog" in Welsh, "eabhrach/iubhrach" in Irish Gaelic and "eabhrach/iobhrach" in Scottish Gaelic, by which names the city is known in those languages). The name was then Latinized by replacing the Celtic neuter nominative ending "-on" by its Latin equivalent "-um",a common use noted also in Gaul and Lusitania. Various place names, such as Évry, Ivry, Ivrey, Ivory and Ivrac in France would all come from "*eburacon / *eburiacon"; for example: Ivry-la-Bataille (Eure, "Ebriaco" in 1023–1033), Ivry-le-Temple ("Evriacum" in 1199) Évry (Essonne, "Everiaco" in 1158), etc.