Eureka, Utah
The city was named from the Greek word "eureka", meaning "I have found it!" The city and its history was explored on the show "Ghost Adventures" in 2018.
Yekke
Another theory is that the word derives from "Yekkef", the Western European pronunciation of the name "Jacob" or "Jack", which differs from the Eastern European pronunciation, "Yankef" or "Yankev" (also see German "Jäckel", pronounced "yekkel", the German diminutive form of Jakob).