I ended up using my real family name. So far though, I think only suitable workaround is to hide it for your alts as suggested above.
In addition, excuse me if totally wrong on the matter, but aren't Humans and Cyborgs quite easy to mix. For example, my character is a cyborg (as in-game choice); however, RP wise it is human that has his head burned on the left side, so medics patch him up with some metal plates. You can always twist the background story a bit if you ask me