The Real Reason Area 51 is Called Area 51

Area 51 is a top-secret U.S. research facility that gets mentioned all the time
in alien movies. “In addition to isolation, the 3.5 million acre region around
and including Area 51 boasts other qualities that make it an excellent place to
conduct secret tests and training,” Today I Found Out.

https://www.yahoo.com/tech/s/real-reason-area-51-called-area-51-164001329.html