Mine is in my sig, though most seem to miss it. Jeremy Anthony Kinsey. The "MIA", is an acronym for my ISP Mia.Net (Maria's Internet Access), I am neither Maria, nor am I am female, as many seem to assume by the "Mia" name. The business was named after my mother. Plus having a 10 year old 3 letter domain is pretty cool!
Legal name changes generally require an attorney and lots of paperwork, SS changes (in the US) among other things.. It can run in the thousands!