Nothing that I know of....it is indeed a very old and well-reputed name, Maybachs used to be cars for the "Hautevolee", which is basically the reason DCX used the name for its own Over-the-top-line. The idea came from Toyota, of course, calling their own topline Lexus. Obviously DCX thought there are people out there who find it offensive to fork out 200,000 and more for a mere Mercedes...and need another premium name. Well, not that many it seems
When DCX came forward with this idea, most people, even car lovers said "Oh, THAT'S where the name went"...basically nobody knew, probably most Mercedes guys had forgotten either!