In Stephen King’s novel Doctor Sleep, the boy from The Shining is grown up as Dan Torrance.
Dan is the adult version of Danny Torrance, the child who survives the Overlook Hotel in The Shining. Doctor Sleep follows him as he struggles with alcoholism, works toward recovery, and uses his psychic ability to help a gifted girl named Abra Stone.
The nickname Danny belongs to his childhood identity, while Dan is the name used for him as an adult. Jack Torrance is his father, so the two Torrance names are related but refer to different characters.
Doctor Sleep was published in 2013 as a sequel to The Shining. King’s novel revisits the earlier book’s supernatural concept of “the shining” while shifting the focus from a haunted hotel to Dan’s recovery and his connection with Abra.