It's a horror novel. It mainly tells a story full of mystery and horror involving theBye - Bye Man, a malevolent entity. People who become aware of him start to experience terrifying and strange events.
Definitely not. The Bye Bye Man is purely fictional. Horror movies like this typically draw from the imagination of the writers and directors to scare and thrill the audience, not from real-life events.
The Bye Bye Man isn't based on any true events. It's a product of imagination and creative writing in the horror genre. Don't expect to find any real facts behind it.