Nook

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Middle English (denoting a corner or fragment): of unknown origin.

wiktionary

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From Middle English noke, nok(“nook, corner, angle”), of uncertain origin. Cognate with Scots neuk, nuk(“corner, angle of a square, angular object”). Perhaps from Old English hnoc, hnocc(“hook, angle”), from Proto-Germanic *hnukkaz, *hnukkô(“a bend”), from Proto-Indo-European *knewg-(“to turn, press”), from Proto-Indo-European *ken-(“to pinch, press, bend”). If so, then also related to Scots nok(“small hook”), Norwegian dialectal nok, nokke(“hook, angle, bent object”), Danish nok(“hook”), Swedish nock(“ridge”), Faroese nokki(“crook”), Icelandic hnokki(“hook”), Dutch nok(“ridge”), Low German Nocke(“tip”), Old Norse hnúka(“to bend, crouch”), Old English ġehnycned(“drawn, pinched, wrinkled”).

etymonline

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nook (n.)

c. 1300, noke, "angle formed by the meeting of two lines; a corner of a room," a word of unknown origin. Possibly from Old Norse and connected with Norwegian dialectal nokke "hook, bent figure," or from Old English hnecca "neck," but the sense evolution would be difficult. OED considers the similar Celtic words to be borrowings from English. Meaning "remote or secluded place" is by late 14c.