I have been in email contact with some folks who also know this area. Richard Bauckham, teaches at St. Andrews University in Scotland. Bauckham will be writing a more complete piece more detailed piece for Chris Tilling, who will post it on his blog (Chrisendom). The fact the Mariamne/Mariamnou/Mara name is written in Greek (not Hebrew or Aramaic) is potentially significant and raises a variety of scenarios that seem to tell against the Mary Magdalene connection. Details will be coming. Martin Hengel, Professor emeritus at the University of Tübingen in Germany and one of the top scholars on the Judaism of this period in the world, simply says the view is "pure nonsense."
More Ideas on the name Mariamne to Come from Europe and Another Opinion - March 1