I've personally decided to go with Hikari (light) for my female Monk, and Kage (shadow) for my male Demon Hunter. Brings about a nice contrast of the two. I might also settle with Ryuusei (meteor) for my male/female Wizard. But beyond those, I'm not quite sure yet.
And yes, my love for japanese-esque names is quite evident among my WoW characters as well.