Belle-Etoile's list "Arthurian Myth Names" of 3 great name ideas: Percival - Emrys!

Arthurian Myth Names

There are several Percivals scattered through the Harry Potter series, which might help transform the old-fangled, fussy image it has accrued. Actually, the original Percival was the one perfectly pure Knight of the Round Table, a worthy hero. The name was invented in the twelfth century by a poet named Chretien de Troyes, for his ideal knight in the poem Percevale, a Knight of King Arthur. 
 Percival is found in other forms of literature as well, including Wilkie Collins's The Woman in White, and Tennyson's "Idylls of the King" contains a section devoted to Sir Percival. Wagner transformed the name to Parsifal for his opera.
 Percy, which seems like a nickname for Percival but is really a stand-alone Norman place name, is beginning to attract some favorable attention from cutting-edge namers.

Percival

An interesting and attractive multicultural choice, Tor packs a lot in to three letters. It may be used as a modern form of Þórr (Thor) , the name of the Norse thunder god or as a short form of Victor/Viktor and Hector, giving it the meaning "conqueror, victor" or "holding fast".
 
As a Hebrew name, it means "turtle-dove" and is a favorite choice for babies born in spring, when turtledoves arrive, especially as a middle, while as an English word name, it may refer to a rocky peak or hill, as in the Glastonbury Tor.
 
Pronunciation varies depending on language and region, but in Scandinavia, it is typically TOOR, while in English and Hebrew, it would be TAWR.

Magical and powerful, but gentle and approachable too, Emrys is a Welsh name which may be worth considering if you're looking for something less common that Dylan, Evan, or Morgan. An offbeat epithet of the wise wizard Merlin, it's currently in the Welsh top 100 and in the England and Wales Top 500 over all. 

Root name Ambrose is an ancient saints' name, derived from the Greek ambrosia, the food and drink of the gods that conferred immortality, adding to the magical feel of the name. Parents today may also associate it with the BBC show Merlin which notably used the name as an alternative name for the warlock. 
 
In the US, Emrys has also been rising and a recent year saw it chosen for more than 180 boys, and 40 girls.