Eureka Classis
On June 7, 1911, seven ministers and sixteen congregations organized to form the Eureka Classis. The name of the Classis came from the Greek word ‘eureka’ which means ‘I found it’ and not on the town Eureka, South Dakota, where the second meeting of the Classis would be held. The name was designed to mean that they had found a solution to their doctrinal problems with the rest of the denomination.
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).