To be honest, it's not the pseudonym that annoys me so much as the variation, so maybe there should be two categories, the consistent pseudonymous and the rampant pseudonymous. Consistents are cool because their real name becomes irrelevant making them de facto onymous. The rampants are the problem.I have to say that I am probably guilty of causing some confusion myself. Whilst 'Lisa Rullsenberg' isn't exactly a rocket-science variation of my actual name, the email account I use for blogmail goes with the name "Leesa Chapman". The best explantion I can offer is that Chapman is an old family name and Leesa was my idle way of varying my first name to get another email account.
*does what it says on the tin.