Try thinking about aggressive concepts (like weapons) to get your creative juices flowing for heavy metal band names.
You could also try looking up some of your favorite heavy metal lyrics to see if a word sticks out to you there to put into the generator.
And if you’re still having trouble coming up with a word to put in the heavy metal band name generator, try coming up with something your bandmates have in common.
For instance, if you’re all from a particular city, you could throw that city in the generator.
Don’t overthink it, and feel free to hit generate as many times as you need to find something you like!