merlin (n.)

small, strong European species of falcon, late 14c., merlioun (perhaps early 14c.), from Anglo-French merilun, a shortened form of Old French esmerillon "merlin, small hawk" (12c., Modern French émerillon), from Frankish *smiril or some other Germanic source (compare Old High German smerlo, German Schmerl "merlin"). Spanish esmerejon, Italian smeriglio also are Germanic loan-words. OED rejects connection with Latin merula "blackbird."


name of the sorcerer and soothsayer in Arthurian legends, from Old French form of Welsh Myrddhin, probably from Old Celtic *Mori-dunon, literally "of the sea-hill," from *mori "sea" (from PIE root *mori- "body of water") + dunom "hill" (see dune).

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Definitions of merlin from WordNet
merlin (n.)
small falcon of Europe and America having dark plumage with black-barred tail; used in falconry;
Synonyms: pigeon hawk / Falco columbarius
Merlin (n.)
(Arthurian legend) the magician who acted as King Arthur's advisor;