Jasper is a good name. It can be made to seem quite eerie, perhaps a Jasper who has some dark secret or power. Then there's Heath. It can remind people of desolate, spooky places. Also, the name Blade. A boy named Blade could be a slasher - type character in a horror story, always armed and dangerous. When choosing names for a horror story, you want to pick ones that create an instant sense of unease or mystery.