In traditional English folklore evil spirit or hob-goblin are usually big and black that scare children. The Bogey-man or Boogie-man only visit at night into the bedrooms and the side of the beds. The appearance of a Bogey is a silhouette of a man. In Welsh, the Bogey is called bwg (ghost) bogle in Scotland and Boogieman in German. Other names it’s called are a bug-a -boo, boo bugbear, bock and boggart. The Irish equivalent is puca that is similar. Bogey is another name for the devil as well.
Rosemary Ellen Guiley, the Encyclopaedia of Demons and Demonology, 2009, Bogey, p 33