once when there was english lesson and i was struggling to remember all the gradations of the adjectives we had to learn i thought ''all right this is strong,stronger and the strongest next one is good,gooder,goodes.... wait that's not it it's good,better,the best'' and then when i had to choose username it came to my mind that gooder sounds kinda original so i might as well use it.101 was just some accidental mash of the keyboard,don't ask me
My ign before i changed my name was xXdinorabbitXx. I got the name "dinorabbit" from the card game yugioh and it is a name of a yugioh deck that was really popular. When i tried to make an osu account, "dinorabbit" was taken, so i was forced to add x's. 7 months later i decided to change my name, and with a quick google search you can tell where i got it from.
Neon Samurai was my old username I used, but I ended up just shortening it to Murai. However, when I made my osu! account, Murai was already taken, so I added Samurai to the end. Simple as that. I guess it kinda links back to my old username.