Etymology
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Nibelungenlied (n.)
German epic poem of 13c., literally "song of the Nibelungs," a race of dwarves who lived in Norway and owned a hoard of gold and a magic ring, literally "children of the mist," from Proto-Germanic *nibulunga-, a suffixed patronymic form from *nebla- (source of Old High German nebul "mist, fog, darkness," Old English nifol), from PIE root *nebh- "cloud." With lied "song" (see Lied).
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*nebh- 
Proto-Indo-European root meaning "cloud."

It forms all or part of: nebula; nebular; nebulosity; nebulous; Neptune; Nibelungenlied; Niflheim; nimbus.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nabhas- "vapor, cloud, mists, fog, sky;" Greek nephele, nephos "cloud;" Latin nebula "mist, vapor, fog, smoke, exhalation;" German Nebel "fog;" Old English nifol "dark, gloomy;" Welsh niwl "cloud, fog;" Slavic nebo.
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