I've never really had any nicknames that stuck...
When I was younger (elementary school) my best friend April and I would go down to a little deli in our neighborhood when we had saved up enough change to buy something to eat there. One day the owner asked if she was born in April, but her birthday was in September.
So they called us July and September.
For a while at the Nationals, when I was much younger, there were always big "fights" for collecting the brass on one team match day. (Too long and involved to explain, let's just say that the brass (spend cases from shooting) was like gold to shooters.) Well, I was a bit, erm, aggressive in making sure that my team got all of our brass, and kinda earned the nickname "The Brass Dragon".
There's only a couple people who still remember those days!