"small, strong European falcon," early 14c., from Anglo-Fr. merilun, an aphetic form of O.Fr. esmerillon (Fr. émerillon), from Frank. *smiril (cf. O.H.G. smerlo, Ger. Schmerl "merlin"). Sp. esmerejon, It. smeriglio also are Germanic loan-words.
sorcerer and soothsayer in Arthurian legends, from O.Fr. form of Welsh Myrddhin, probably from O.Celt. *Mori-dunon, lit. "of the sea-hill," from *mori "sea" + dunom "hill."