I have an Internet-wide unique last name. There's few computer-literate Schwerns in the world (and if I have my selfish way it will remain that way!) You might find a mention of my father finishing a race. Or my relative Jürgen who builds yachts. But its basically just me.
And that's handy, "Schwern" is available on pretty much every system. But having your handle be your real name means there's no wall between the Internet and your real life, especially as I finally start to get into non-programming social networks. Sometimes I want to have a secret identity on the Internet. In that case I cleverly disguise myself as "Xwrn" (bonus points to anyone who knows why that name).