"Nick" (or "Old Nick")
A well-known British nickname for the devil, comparable with the American "Mr. Splitfoot " or "Old Scratch." It seems probable that this name is derived from the Dutch nikken, the devil, which again comes from the Anglo-Saxon noec-an, to slay, deriving from the theological view that the devil was "a murderer from the beginning."
In northern countries there is a river spirit named "Neck," "Nikke," or "Nokke," of the same nature as the water kelpie and the merman or triton.