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.
Eureka, Illinois
Eureka was originally laid out as "Walnut Grove" in 1855. The name was changed to "Eureka" because of a naming conflict with another Walnut Grove. Sources differ on who proposed the name Eureka. The city is named from the Greek expression Eureka, meaning "I have found it".