A problem with Varus being a darkin now

Well as you probably know Varus's short bio is up and it seems that Varus is the name of the darkin and he will be one of the 3 named darkin the others being Aatrox (that means cluel ,vile ,dark) Rhaast (that apparently means obey) . The problem is that Varus is the term for a knee deformity and doesn't have the "aa" in his name. Is it just me or he seems pretty out of place?

    Also here's the new bio for Varus:

One of the ancient race of darkin, Varus was a deadly killer who loved to torment his foes, driving them almost to insanity before delivering the killing arrow. He was imprisoned at the end of the Darkin War, but escaped centuries later in the remade flesh of two Ionian hunters—they had unwittingly released him, cursed to bear the bow containing his bound essence. Varus now seeks out those who trapped him in order to enact his brutal vengeance, but the mortals' souls within him still resist every step of the way.