Wiktionary's etymology:
From Middle English mery, merie, mirie, myrie, murie, murȝe, from Old English meriġe, miriġe, myriġe, myreġe, myrġe (“pleasing, agreeable; pleasant, sweet, delightful; melodious”), from Proto-West Germanic *murgī (“short, slow, leisurely”), from Proto-Germanic *murguz (“short, slow”), from Proto-Indo-European *mréǵʰus (“short”). Cognate with Scots mery, mirry (“merry”), Middle Dutch mergelijc (“pleasant, agreeable, joyful”), Norwegian dialectal myrjel (“small object, figurine”), Latin brevis (“short, small, narrow, shallow”), Ancient Greek βραχύς (brakhús, “short”). Doublet of brief.
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