It's the name "Merlin." Because it's not a name to me right now. Either it's a title (as in The Mists of Avalon or the Elizabeth Bear series I'm reading) or it's an expletive (which is how it's used in Harry Potter, both the books and the fanfiction.) So, in either case, I'm having a hard time applying it to the latest beautiful dark-haired boy with powers.
Fandom does love the beautiful dark-haired boys with powers.