How does one know the name of their stand?

I know that in Stardust Crusaders, stands are mostly named by tarot cards. However, I've started Diamond is Unbreakable recently, and was wondering how characters seem to automatically know their stand's name. The Hand is kind of an obvious one, but what about something like Bad Company or Red Hot Chili Pepper? Does the character name it themselves or does it just come to them when they get their stand? Is this something that gets explained later? I'm newer to JJBA, sorry if its obvious