Final answer:
Lake Bonneville
Step-by-step explanation:
The name of the lake whose evaporation formed the Great Salt Lake is Lake Bonneville.
Lake Bonneville was a prehistoric lake that existed thousands of years ago in what is now Utah.
It was much larger than the current Great Salt Lake and covered a large portion of the state.
Over time, the lake gradually dried up, leaving behind the Great Salt Lake as a remnant.