From Proto-Tungusic *ñaŋsa.
няңня • (transliteration needed)
From Proto-Tungusic *ńaŋńa (“clear sky”), compare Even няни̇н (ņaņi̇n), Manchu ᠨᡳᠶᠠᠩᠨᡳᠶᠠ (niyangniya, “clear sky”), Udihe њаӈња.