As to the Samurai, Sulu was not originally Japanese, right? I've read that here, I think, that he was kinda pan-Asian, with "Sulu" actually being a sea near the Philippines. Later an author (V. McIntyre?) named him Hikaru and Japan-i-fied him, IIRC. My apologies if this has been covered. I do keep coming back to this thread to see if the train has totally wrecked yet, but I haven't read all posts.
(And do NOT argue with me, even reasonably, or you are a hater and I will take my keyboard and leave this board. I will!)
I'm going to catch hell for this, I always do, but here goes: Vonda McIntyre did not Japanify Sulu. She had nothing to do with coming up with his name, other than to read the memo Gene Roddenberry wrote giving the name Hikaru.
I say this because I asked George Takei at a Star Trek convention. He was a guest at Star Con Denver in 1990, and while he was onstage, I personally asked him if he knew what Sulu's given name was ever intended to be. I wanted to know because several names had been offered by other writers (Hikaru was not ever one of them), and was curious if one had been in the offing. George Takei responded that during production of TOS, GR had sent a memo around, even to Takei, saying that if the opportunity presented itself, Sulu's given name was to be presented as "Hikaru". I thanked him, the audience applauded, and just over a year later, ST:VI came out, settling the issue.