Geographic nomenclature

The other night I was musing with one of the other interns about the names of young patients we had been seeing, and the following question formed in my mind:

Why is it that there are so many kids around today (the parents of whom should have been given a good slapping) with names like Dakota (or Dakoda or Dekoda or…) or Montana, or Dallas?

Additionally why is it that Australian parent see fit to name after American geography, and yet you never see kids named Tasmania, or Adelaide, or Canberra? Canberra’s a nice name for a girl don’t you think?