So far, all the stories are very intriguing and captivating. I always find it fascinating to listen to other people's stories about how they came up with their online nicknames.
As for me, when I was around 9 or 10 years old, I saw a video on YouTube where a guy in World of Tanks was signed as Dehander. I believe he was german. To my childish mind, it sounded incredibly powerful, and I started using this nickname myself, only adding the numbers 28 (which doesn't really symbolise anything).
A few years later, when I was playing an online game with my friends, we used online chat. Our nicknames were relatively long, so we decided to shorten them for simplicity, which is how my friends started calling me deha. It was then that I realised that I was actually using someone else's nickname and would be better off changing it. I liked it so much that after that, I always started signing myself as deha28.
By the way, a few years ago, I noticed that many users on Steam were also named deha. As it turned out, deha means genius in Turkish (it's quite arrogant to call myself a genius). This word was not as unique as I thought.
