Weekly

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Old English wice, of Germanic origin; related to Dutch week and German Woche, from a base probably meaning ‘sequence, series’.

wiktionary

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From Middle English wekely, weikly(adverb), equivalent to week +‎ -ly. Compare Dutch wekelijks(“weekly”), German wöchentlich(“weekly”), Danish ugentlig(“weekly”), Norwegian ukentlig(“weekly”), Icelandic vikulega(“weekly”), Swedish veckovis(“weekly”).

etymonline

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weekly

mid-15c. (adv.); late 15c. (adj.), from week + -ly (2). As a noun meaning "weekly newspaper" it is recorded from 1833.