Windy

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Old English windig (see wind1, -y1).

wiktionary

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From Middle English windy, from Old English windiġ(“windy”), from Proto-Germanic *windigaz(“windy”), equivalent to wind +‎ -y. Cognate with Saterland Frisian wiendich(“windy”), West Frisian winich(“windy”), Dutch winderig(“windy”), German Low German windig(“windy”), German windig(“windy”), Swedish vindig(“windy”), Icelandic vindugur(“windy”).

wind(“to curve, bend”) +‎  -y

etymonline

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windy (adj.)

Old English windig "windy, breezy;" see wind (n.1) + -y (2). Meaning "affected by flatulence" is in late Old English. Chicago has been the Windy City at least since 1885.