Would this be a real word?

Hi all,

I studied Chinese a couple of years ago, even lived in Changsha for about a year and went to the Hunan University. Sadly, after a degree and years of work in non-chinese fields, my language skills have gotten pretty bad... If my teachers knew :S

Anyway, I am working on a scifi novel set in a world, were rouge AI controlled machines, a bit like fantasy setting trolls, roam the countryside and I was thinking about naming them Jumoji, 巨魔机.

Would this make sense, or is it completely wrong?

Thanks a bunch!