It seems that you're forgetting that Eclipse is not an IDE. It's a foundation. A foundation, similar in some ways to Apache, that owns many different projects. One of them is the Eclipse IDE. The other is Orion. Now tell me, why shouldn't a foundation named "Eclipse" be using the word "Eclipse" in one of it's own projects?

Edit: To be perfectly fair, Eclipse foundation is itself guilty for this confusion, because if you go to the "downloads" page on their site, you only see downloads for Eclipse IDE. You need to go to the "projects" page to see or download any other project.