Tidy

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Middle English: from the noun tide + -y1. The original meaning was ‘timely, opportune’; it later had various senses expressing approval, usually of a person, including ‘attractive’, ‘healthy’, and ‘skilful’; the sense ‘orderly, neat’ dates from the early 18th century.

wiktionary

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From Middle English tidy, tydy, tidi(“timely, seasonal, opportune”), from tide(“time”) +‎ -y. Cognate with Dutch tijdig(“timely”), Middle Low German tīdich(“timely”), German zeitig(“seasonal, timely”), Danish tidig(“timely”), Swedish tidig(“timely”).

etymonline

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tidy (adj.)

mid-13c., "in good condition, healthy," probably originally "in season, timely, opportune, excellent" (though this sense is not attested until mid-14c.), from tide (n.) in the sense of "season, time" + -y (2). Of persons, "of neat and orderly habits," from 1706. Similar formation in Old High German zitig, German zeitig, Dutch tijdig, Danish tidig "timely," Old English tidlic "temporal," also "timely, seasonable."

tidy (v.)

"to make neat, set in order," 1821, from tidy (adj.). Related: Tidied; tidying.