For those that can’t believe it’s not a racial slur.

Niggard (14th C) is derived from the Middle English word meaning ‘stingy,’ nigon, which is probably derived from two other words also meaning ‘stingy,’ Old Norse hnǫggr and Old English hnēaw.[2] The word niggle, which in modern usage means to give excessive attention to minor details, probably shares an etymology with niggardly.[3]