The scanlated manga I have starts off calling Light, raito, and Ryuk, Ryuku, but then, after about vol 5, they say they're changing it to the correct "Light" and "Ryuk" so as to go with the mangaka's wishes. So in any terms, Light and Ryuk are the correct names.
EDIT: Just finished watching episode 5, and i have to say, thats gotta be the worst, most annoying ending for an episode.
EVER.
It'd be even worse if I didn't already know what L looked like.
I'm curious as to whether Light making all of these moves is leading to suspicion on his part. I mean, if he hadn't killed Lind L Taylor, then it would've stopped L from deducing he was in the specified area of Japan, and perhaps would've made L doubt if he was actually in Japan or not.
He's covering his tracks while making more, basically.