My RL first name is sufficiently common that I can relate! (More technically, my legal first name is the common “short”, so people assume it’s the long version, an assumption that is true 85% of the time, but I’m in that 15% minority where it’s wrong. And that 15% includes it being a short version for other common names too.)
BronxWench was my gamer name for ages, and I kept it as my name over on FFN. Because I am seriously creative, it’s also my pen name everywhere else, except fro what I publish. Then I turn into Morwen Navarre.
Honestly, I sometimes don’t answer to my real name…