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English

From Middle English kay, key, kaye, keye, from Old French kay, cail (modern French quai), from Gaulish *kagyum, cagiíun (enclosure), from Proto-Celtic *kagyom (pen, enclosure) (compare Welsh cae (hedge)), from Proto-Indo-European *kagʰyóm (enclosure).

Vietnamese

From Proto-Vietic *kweː.