That is, “the Supreme God” or, “the Most Sovereign God” or, “the Most Powerful God.” The meaning of “high” here refers to God’s greatness. It does not refer to altitude or being tall.
This was the name of the group of demons, but it also describes that the evil spirits were very numerous. Use the name if the note that follows will make the meaning clear in your language. If not, you may need to translate the word as something like, “Army” or, “Crowd” or, “Thousands.”