"CEO" was given to me VERY, very early: on the old Prodigy online service in (gulp) 1990.
We had a small, friendly huddle under the "Homelife-GET O" topic on this very early online service. Back then, women were outnumbered 10 to 1 online, and you can bet that the "GET O" part of our name attracted some unwanted attention.
Anyway, PinkE and ML in Midlife and Lissum and my other online friends all had cool usernames; one day, I popped up and asked, "How do I get a cool username, too?"
Since Prodigy made you log in as firstname-lastname, making me CynthiaEwer, SOMEBODY suggested that I add, "Organized" to the end, or "Cynthia Ewer, Organized". Using the initials, that made me "CEO". To my immense regret, I never remembered exactly which godmother who christened me--but "CEO" it was.
It stuck. Unbelievably, CEO is still around EIGHTEEN years later. How time does fly ...
CEO