More on Nickar from Infoplease:

• Nickar - Nickar or Hnickar. The name assumed by Odin when he impersonates the destroying principle. (Grimm: ...
• Nick - Nick in Scandinavian mythology, is a water-wraith or kelpie. There are nicks in sea, lake, river, ...
• Dictionary of Phrase and Fable: N - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "N"