Probably from niuha, niu- + -kka (like tiuha ~ tiukka). Similarity with Swedish njugg appears to be a coincidence.
niukka (comparative niukempi, superlative niukin)
| Inflection of niukka (Kotus type 9*A/kala, kk-k gradation) | |||
|---|---|---|---|
| nominative | niukka | niukat | |
| genitive | niukan | niukkojen | |
| partitive | niukkaa | niukkoja | |
| illative | niukkaan | niukkoihin | |
| singular | plural | ||
| nominative | niukka | niukat | |
| accusative | nom. | niukka | niukat |
| gen. | niukan | ||
| genitive | niukan | niukkojen niukkain rare | |
| partitive | niukkaa | niukkoja | |
| inessive | niukassa | niukoissa | |
| elative | niukasta | niukoista | |
| illative | niukkaan | niukkoihin | |
| adessive | niukalla | niukoilla | |
| ablative | niukalta | niukoilta | |
| allative | niukalle | niukoille | |
| essive | niukkana | niukkoina | |
| translative | niukaksi | niukoiksi | |
| abessive | niukatta | niukoitta | |
| instructive | — | niukoin | |
| comitative | — | niukkoine | |
From Proto-Malayo-Polynesian *niuʀ.
niukka