A few questions and remarks:

1. Are they ever actually called the Moya Brothers? The ending credits lists them as the Moya-nin (モヤ忍, Haze shinobi).
2. If they aren't called brothers, it is doubtful they are actual brothers. Although the leader is called big brother (アニキ, aniki) (which is not a name, by the way), the other two are simply credited as Moya-nin underlings (モヤ忍 手下, Moya-nin teshita). Aniki is often used by gang members to call their leader.
3. Which brings me to my next point, I haven't found any evidence of the two underlings' names actually being Mo and Ya.
4. The two underlings are voiced by Hideo Watanabe.
5. The mark on their forehead protectors isn't a question mark, it is a stylised haze cloud.
6. They might have been pathetic shinobi, but from what I've seen (which isn't a lot, i just skimmed through the episode), they aren't completely without skill. Those poisons they used made quite well.

--ShounenSuki ^{(talk | contribs)} 00:50, February 28, 2010 (UTC)

Only thing i heard them call themselves is moya triad. And they never called or referenced each other as brothers or were named.Simant (talk) 04:15, February 28, 2010 (UTC)

All the pages concerning them, including the episode, have been updated. ¥ Super Novice ↔ Talk ² Me ¥ 04:21, February 28, 2010 (UTC)

Just a thought, it is possible they were named in Naruto: Path of the Ninja 2. Simant (talk) 04:23, February 28, 2010 (UTC)