That's cool didn't know niggardly came through english from norse. I would have guessed it was from a romance language.
My favorite website after Kiwifarms is wiktionary. I love looking at the etymology of different words. And you can click through all the links and see how different words are related.
Etymology
From Middle English nigard, nygard (“miser”), from nig (“niggardly person”), possibly of Scandinavian origin; compare Old Icelandic hnøggr (“miserly, stingy”), Old Norse *hniggw, with descendants Swedish njugg (“stingy”), dialectal Swedish niggla (“be stingy”), dialectal Norwegian nigla.[1][2] Ultimately from Proto-Germanic *hnauwjaz, source of Old English hneaw (“stingy”), replaced by Middle English nig. Possibly cognate to niggle (“miser”).[3] Compare German Knicker (“niggard”), knickerig (“niggardly”). Unrelated to the word nigger, but see the usage notes.