Many people equate the word “daemon” with the word “demon”, implying some kind of satanic connection between UNIX and the underworld.
This is an egregious misunderstanding. “Daemon” is actually a much older form of “demon”; daemons have no particular bias towards good or evil, but rather serve to help define a person’s character or personality.
The ancient Greeks’ concept of a “personal daemon” was similar to the modern concept of a “guardian angel”—eudaemonia is the state of being helped or protected by a kindly spirit.
As a rule, UNIX systems seem to be infested with both daemons and demons.
— Unix System Administration Handbook, page 403, by Evi Nemeth.