The SR71 was called the Blackbird and the Habu when first flown out of Kadena AFB, Okinawa.
It is funny how an unofficial nickname can overtake an official nickname
The classic is the Huey....
The UH-1 official name was “Iroquois”... Army helicopters were to have Indian tribe names....
But “Huey” came from the slang for the “UH” designation