I will explain 2 of my usernames, PurpsTheDragon and Jaoheah,
I liked the color purple and I liked dragons, I forget how I came up with it tho.
For Jaoheah, I just decided one day in discord, I was going to change my username to something and I tried to incorrectly spell my first name, Which is Joey, Jaoheah was supposed to be pronounced Joey. Now I pronounce it like this ja ow hey.
First username I remember having is Schaff24, My last name + the number on our address. It was in Club Penguin.