how did headmates/alters get their names?

leaving this as an open question, i think i wanna branch out from just polls. Out of the present crew's names: One of us stole our middle deadname, one of us named themselves after their favorite song at the time, one of us is associated so strongly with the concept described by their name that it became their name, one of us just went off vibes(? I don't actually remember beyond it feeling right)…