I have not checked them for accuracy or authenticity. They seem to choose a single letter for the First Family names.
Example:
RELIANT RONALD P. REAGAN
RHYME MAUREEN REAGAN
RIBBON PATTI REAGAN DAVIS
RIDDLER MICHAEL REAGAN
ROSEBUD MAUREEN REAGAN
Tell me dopers, what are your guesses?
I gotta wonder, what the hell is the point of having code names if any bozo can look them up on the Internet? Sure, they change them up once in a while, but still. I imagine they’re on secure frequencies, but surely the agents using them are out among the public too.
WAG: They might be using them for the same reason people use ‘niner’, ‘bravo’, ‘whiskey’, etc: to reduce the chance of misinterpretation. It’s not a big strech to imagine ‘Sasha’ being confused with ‘Michelle’ on a noisy radio connection, for example.
Code names are not chosen as much for secrecy as for clarity. It is important that everyone knows what is meant during a communication. The code names selected are such they would not be used during ordinary conversation, (briefcase, or sandwich for example.)
I remember what they gave Jesse Jackson (Pontiac) and then everybody denied they knew what it meant. The names come from the White House Communications Agency.