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In page Nuckelavee:

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The late 19th century saw an upsurge of interest in transcribing folklore, but the recorders used inconsistent spelling and frequently anglicised words, thus the same entity could be given different names.[1] The term nuckelavee derives from Orcadian knoggelvi,[2] and according to Orkney resident and 19th-century folklorist Walter Traill Dennison means "Devil of the Sea".[3] The same demon is called a mukkelevi in Shetland, where it was considered a nasty sea trow or sea devil.[4] Samuel Hibbert, an antiquarian of the early nineteenth century, considered the component nuck of the nuckelavee's name to be cognate with both the Nick in Old Nick, a name sometimes given to the Devil of Christian belief, and with the Latin necare, to kill.[5]