User blog comment:Dispelling Mage/Omake: Lucy & Migi - Review/@comment-84.151.161.15-20150831093805/@comment-7418318-20150831211950

That's also why Migi chose that name for itself.

It doesn't care at all for names and only chose a name because Shinichi insisted, so it picked something simplistic and yet fitting, which is just "right" in japanese.

Just like the other parasite who failed to invade his host's brain is called "jaw" (though the host prefers to call him John it'd seem), due to being placed exactly there, on the Human's jaw, neck and upper chest.