It seems rather unlikely at that point in history that a mother's middle name would be used for a
son unless people realized it was originally a surname. So I would guess that Tamber is an alternative spelling of Tambur or Tambour, surnames which originally meant "drummer". Though it seems to be rare, there are examples of Tamber as a surname on the Worldwide Web. For example, there is a physician named
Michael Tamber in
Everett,
Washington:
http://www.everettclinic.com/Physicians/Michael_Tamber.ashx?p=2317&srchloc=1
and a freelance journalist named
Caryn Tamber who lives in Baltimore, Maryland, and writes for many different publications.