aught

From Middle English aught, ought, from Old English āht, āwiht, from ā (“always", "ever”) + wiht (“thing", "creature”). More at wight.

Rebracketing of a naught.

From Middle English aught (“estimation, regard, reputation”), from Old English æht (“estimation, consideration”), from Proto-West Germanic *ahtu. Cognate with Dutch acht (“attention, regard, heed”), German Acht (“attention, regard”). Also see ettle.

Originally the past tense of owe.

From Middle English ahte, from Old English eahta (“eight”). More at eight.