Handiwork

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Old English handgeweorc, from hand + geweorc ‘something made’, interpreted in the 16th century as handy + work .

wiktionary

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From Middle English hondywerk, handiwerc, from Old English handġeweorc(“work done by hand, creation”), from hand(“hand”) + ġeweorc(“work”), equal to hand +‎ work. Compare Saterland Frisian Hondwierk, Dutch handwerk, German Handwerk.

etymonline

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handiwork (n.)

late 12c., from Old English handgeweorc "work of the hand, creation," from hand (n.) + geweorc, collective form of weorc "work" (see work (n.)). Old English collective prefix ge- regularly reduces to i- in Middle English, and the word probably came to be felt as handy + work.