Leaky

google

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late Middle English: probably of Low German or Dutch origin and related to lack.

wiktionary

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Likely a normalisation ( +‎ -y) of earlier leak, leake, leke(“leaky”, adj), from Middle English leke(“leaky”), from Old English hlec, *lec(“having cracks or rents; leaky”), from Proto-Germanic *lekaz(“leaking; leaky”); surface analysis as leak +‎ -y. Cognate with Scots lek, leck(“leaky”), Saterland Frisian läk(“leaky”), Dutch lek(“leaky”), German Low German leck(“leaky”), German leck(“leaky”), Swedish läck(“leaky”), Icelandic lekur(“leaky”).

etymonline

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leaky (adj.)

mid-15c., from leak (n.) + -y (2). Related: Leakiness. Slang sense of "unable to keep a secret" attested from 1704.