I went backwards, I used my forum name for my GT, albeit with a '0' at the end (PsychicPsycho 0), since the zeroless version was already taken . I've always been curious if someone on here saw it and used it first.My XBOX Live Gamertag
I stopped using Whale55 as a username a good 4 years ago. It was one of three forum usernames I used: Wailord55, Wailmer55 and Whale55. The idea behind all three of them was incredibly obvious. I liked whales and the whale pokemon (I still do) and 55 was my favorite number. Thus Whale55 and various other forms were born.
I'll be changing it as soon as I'm allowed to, which won't be for a few months.
Nowadays I go by Isaac because that's a nickname of mine. And Insignificant Organism is what I use most frequently now, out of respect for all my fellow prokaryotes.