E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Nix (mas.), Nixie (fem.).
Kind busy-body. Little creatures not unlike the Scotch brownie and German kobold. They wear a red cap, and are ever ready to lend a helping hand to the industrious and thrifty. (See NICK.)
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Another tribe of water-fairies are the Nixes, who frequently assume the appearance of beautiful maidens.T. F. T. Dyer: Folk-lore of Plants, chap. vii. p. 90.