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.
Eucla, Western Australia
The name Eucla is believed to originate from an Aboriginal word "Yinculyer" which one (uncited) source gives as referring to the rising of the planet Venus. It was first used by Europeans for the area at some point before 1867.