Merriam-Webster Collegiate Dictionary - merlin

 noun  Etymology: Middle English merlioun, from Anglo-French merilun, alteration of esmerilun, augmentative of Old French esmeril, of Germanic origin; akin to Old High German smiril ~  Date: 14th century a small compact falcon (Falco columbarius) of the northern hemisphere having a broad dark terminal band on the tail and upperparts that are slate blue in males and brown in females MERLIN  noun  Etymology: Medieval Latin ~us, from Middle Welsh Myrddin  Date: 13th century a prophet and magician in Arthurian legend