The Maemo operating system (which includes several iterations) was originally developed by Nokia & used in several commercially available devices, including the N900 and the N9. Much of Maemo is currently open source software as defined by the Open Software Foundation and, as such, continues to be improved by a volunteer community at www.maemo.org.
Nokia has registered Maemo as a trademark in several countries and have not, at least yet, decided to license us to use it. Rather than spend months in limbo, we selected Hildon because it is not registered by Nokia and has some historical significance. I'm not sure if we should try to proceed under the name of maemo in any event since the reputation among the general public (not the informed and more knowledgeable community here) is that it is an old, obsolete and outdated software.