This has come up before, actually, so it’s clearly a question more people have
It didn’t get much traction, though.
My two cents: I don’t think it matters. The idea of pseudonyms on the internet is pretty well understood. I think as long as it is not something puerile or offensive, then it’s ok.
FWIW, the guy that wrote You Don’t Know JS, Kyle Simpson, goes by Getify on Github, and no-one would turn him down