Once upon a time, there was a wily mercenary known throughout the land. After several violent battles and horrific wars, the mercenary suffered many an injury, losing limbs and becoming so scarred as to be unrecognizable as a human being. Complicated surgeries and bio-mechanical implants imparted the jack with cybernetic limbs and eyes and "he" became known as Mercen-X... or so the legend goes. Years later when the merck's trademark motorcycle helmet was removed, it was discovered that "he" was just a normal person whose name was... Mercen-X.
TL;DR... Long before I was Mercen-X... I was always Mercen-X. I did try to change my name at one point to Söldner-X which just means Mercen-X in German.