IIRC, Merlin's original name was "Myrdin" or something along those lines but the author of the popular King Arthur story changed it to Merlin because the original name sounded too close to the French word for shit.
“Where the longleaf pines are whispering
to him who loved them so.
Where the faint murmurs now dwindling
echo o’er tide and shore."
-A Grave Epitaph in Santa Rosa County, Florida; I wish I could remember the man's name.
That much is obvious. Though in general you want to integrate familiar elements and concepts to avoid alienating your readers. But at the same time you don't want to "borrow" too much, because you want it to have its own identity.
Regardless I've come up with another name for the title that sounds better in my mind.
My visit with Vorador only strengthened my resolve. His power uncontested by mortals, he had fallen to another enemy. Decadence has claimed itself many a great warrior.