I really don't think it matters. Employers have better things to worry about than whether you use a pseudonym for your online work. We're usually bright enough to detect people who claim authorship of modules that they didn't write.

The only person I ever encountered doing this was so dumb they picked a well known CPAN author (chromatic if anyone is interested ;-)

This poor unfortunate came at the end of a long day of interviewing and was mercilessly asked to explain how things like Devel::Constants and Sub::Context worked - and asked to explain why he wasn't quite as american as we thought he should be. Sad.

I judge the code, not the alias. Write good code. Forget about the names.