Locker

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late Middle English: probably related to Flemish loker .

wiktionary

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From lock ( lock +‎ -er) from Old English loc(“fastening, enclosure”), from Proto-Germanic *luką. Cognate with German Loch, Dutch luik, and Dutch loket.

etymonline

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locker (n.)

"small chest that can be locked," late 14c., agent noun from Middle English lokken (see lock (v.)). Especially for individual use in companies of men, as on shipboard or in military regiments. As a characteristic of high school life, 20c. Earlier the word meant "a mechanism for locking" (early 14c.).