It’s the name of an old computer game from the 90s. I never actually played it, but the name kind of stuck in my head. At one point, about a decade and a half ago, I wanted to choose an email address that was unique enough so that spammers couldn’t find me just by trying all common names (which was how an old Hotmail account of mine got ruined). This was the first thing that came to mind and it has since been my goto user name, along with plain Yserbius, for any place I don’t want to put my real name.
It’s also you’re youtube name.