Where does “fjallnykra” come from?

fjallnykra (Icelandic) comes from Icelandic nykra, from Icelandic nykur, from Old Norse nykr, from Proto-Germanic nikwiz-, from Proto-Indo-European neygʷ- — to wash.

fjallnykra (Icelandic): alpine pondweed (Potamogeton alpinus)

Definitions

  1. alpine pondweed (Potamogeton alpinus)

Ancestry of “fjallnykra”, step by step

fjallnykra traces back through two separate lines of ancestry.

via Icelandic nykra

StepLanguageWordMeaning
1Icelandicnykrapondweed plant of the genus
2Icelandicnykura water-demon, the nixie, the nick
3Old Norsenykra water-demon, the nixie, the nick; mostly appearing as a grey horse-like creature with inverted hoofs and forward fetlocks that emerges from lakes
4Proto-Germanicnikwiz-
5Proto-Indo-Europeanneygʷ-to wash

via Icelandic fjall

StepLanguageWordMeaning
1Icelandicfjallmountain
2Old Norsefjallmountain
3Proto-Germanicfelląskin, hide
4Proto-Indo-Europeanpel-to cover, to wrap; skin, hide, cloth; to fold
Every word from Proto-Indo-European neygʷ-Every word from Proto-Germanic nikwiz-Every word from Old Norse nykr