It's not unusual for people to use the name they know you by. In high school, there was someone who addressed me as Ix, the name I used in multiplayer Duke Nukem. He didn't know my name.

There are several people I know primarily through wechat, where it's almost always unnecessary to address people by name because messages have only one recipient. Sometimes this has led to conversations like this:

> What should I call you? 颖？

> OK.

[I was not especially reassured by that response.]

> re was someone who addressed me as Ix, the name I used in multiplayer Duke Nukem

Heh, there are still some people who call me by my nickname back from 2000s. It doesn't help what it means something between "the beast" and "the thing" and I had people of the old clout be quite offended by it. Including my mother.