Ornette wrote:GAINAX does appear in the credits several times, maybe someone who can read Kanji can look at my scans and tell us.
It could be like how they credit Bob Kane in Batman comics. "Batman created by [Bob Kane's signature]." Just a credit to the original rights with Khara (as Seventh said, it's "joy" in Greek) taking credit for Rebuild's revision of the series.
Why did Anno name his company "khara?" Well, maybe it's just a trend that stuff sounds cool in a foreign language. Some people think it's cool when I speak in a foreign language, but I don't see the charm. Then again, I think Russian and German are both interesting languages. The allure of a foreign aspect. While it's normally improbable, I think the handful of admissions that some things were named or done "because it looked/sounded cool" can support that.
Blah, just some idle thoughts. Pay no mind (or half of such if you spared it) to me.