Best serial killer name?

Don't worry, it's for a webcomic.

I originally have used 'Zugzwang Killer', in which Zugzwang means:

a situation in chess, in which the obligation to make a move in one's turn is a serious, often decisive, disadvantage.

Now, the person who suggested this (An RP partner) got it off of Criminal Minds. Just the name, nothing else, but I fear that it would lack originality to use Zugzwang. Are there any other single-letter words like that that I could use for my serial killer's name?

He's a ritualistic, satanic killer who feeds off of fear, is similar to Hannibal Lector and leaves a letter behind at each scene that originally read: "Zugzwang", but again, maybe something else? Please help quick! The main male character has a dark past with the killer, they're out to get each other through the plot, so again please suggest something a bit dark.

Thanks!