Twinkle

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Old English twinclian (verb), of Germanic origin.

wiktionary

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From Middle English twinclen, twynclen, from Old English twinclian(“to twinkle”), equivalent to twink(“to wink; blink; twinkle”) +‎ -le(frequentative suffix). Compare German zwinkern(“to wink; twinkle”).

etymonline

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twinkle (v.)

Old English twinclian "to twinkle, wink," frequentative of twincan "to wink, blink," with -el (3). Twincan is related to Middle High German zwinken, German zwinkern, and probably somehow imitative. Related: Twinkled; twinkling. The noun is recorded from 1540s. Phrase in the twinkling of an eye "in a very brief time" is attested from c. 1300.