Origin: Welsh, English
Meaning: from Welsh Myrddin meaning “sea fortress”.
Meaning: Merlin is a key figure in the King Arthur romance, a sorcerer who is Arthur’s closest adviser and ally. The name was Latinized into Merlinus by Geoffrey of Monmouth because its regular form, Merdinus, was similar to the Anglo-Norman word merde that meant excrement.
Myrrdin Wyllt is a figure in Medieval Welsh legend, depicted as a madman after a battle in which his lord was killed, who went to live in the forest with the animals and received the gift of prophecy. Interestingly enough, this Myrrdin was the same person Geoffrey of Monmouth took and conflated with his character of Merlin .
Merlis is also the name of a species of falcon.
Variants: Merlin, Merlyn