My reply to Mr. R.D. Folk. Many persons here in the U.S.A. and Europe thought the Japanese are the ones who cannot pronounce the letter "R". Japanese can easily say the "R's" like the words "Aregato" and "Sayonara". Chinese people are the ones who can hardly pronounce the letter "R"; I once asked my Chinese-American wife to prepare "fried rice" for dinner, and during dinner time she said to me: "your "FLIED LICE" is ready. I also travel a lot to Hong Kong and Japan during my younger years as a sailor. Therefore, maybe Mr. J.F. Shue is correct: ROW KU or better yet... ROW KOO, if it is really a Japanese word.
I'm going to go out on a limb and say that Roku is like Wii. Chosen because it has no meaning in any language the company knows of. And I agree that, if Leo LaPorte says row-koo that's probably correct.