Originally Posted by The Great Kakashi
Why in the world wouldn't it changed... DUH it's a totally different Jutsu. You can't keep the same name on a changed jutsu, it's the law.
But if you remember Kakashi saying; that Rasengan is an incomplete jutsu. Therefore, we can theorize and lean towards the fact that Naruto is combining Rasengan and his wind chakra together. So "Rasengan" may still be in the name.