Origin of merlinMiddle English merlion ; from Old French esmerillon, diminutive of esmeril, merlin ; from Old High German smirl, merlin
Origin of MerlinMedieval Latin Merlinus ; from Welsh Myrrdin ; from Brythonic an unverified form Mori-dünon ; from an unverified form mori, sea + Proto-Celt an unverified form dunom, hill, fortified hill, fort, hence, literally , sea-hill or sea-fortress
Origin of merlinMiddle English, from Anglo-Norman merilun, from Old French esmerillon, diminutive of esmeril, of Germanic origin.
From Middle English merlone, merlion, marlyon, merlyon, merlinge, from Old French emerillon, esmerillon, from Old Frankish *smiril (“falcon, hawk"), from Proto-Germanic *smirilaz (“falcon, merlin"). Cognate with Old High German smirl (“falcon"), Old Norse smyrill (“falcon").
From "Moesin-Ezrin-Radixin-Like Protein"
Latin Merlinus, itself from the Old Welsh Myrddin.